阅读说明：本技术 用于改进的脱盐设备盐水质量的组合物和方法 (Compositions and methods for improved desalter brine quality ) 是由 J·冈萨雷斯 M·迪翁 P·L·佩雷斯-迪亚斯 于 2020-07-08 设计创作，主要内容包括：改进流出物盐水质量的方法,所述方法(i)提供包含烃的泥浆洗涤溶剂,所述烃的比重小于待处理的脱盐设备盐水的比重；和(ii)将所述泥浆洗涤溶剂加入到脱盐设备系统的泥浆洗涤流中,以提供经处理的流出物盐水。(A method of improving effluent brine quality, said method (i) providing a mud washing solvent comprising hydrocarbons having a specific gravity less than that of the desalter brine to be treated; and (ii) adding the mud wash solvent to a mud wash stream of a desalter system to provide a treated effluent brine.)

1. A method of improving effluent brine quality, the method comprising:

(i) providing a mud washing solvent comprising a hydrocarbon having a specific gravity less than that of the desalter brine to be treated; and

(ii) the mud wash solvent is added to a mud wash stream of a desalter system to provide a treated effluent brine.

2. The method of claim 1, wherein the specific gravity of the hydrocarbon is less than about 1.

3. The method of claim 1, wherein the specific gravity of the hydrocarbon is less than about 0.7.

4. The process of claim 1 wherein the hydrocarbons comprise (i) kerosene, (ii) naphtha, (iii) diesel, (iv) aromatic naphtha and/or (v) heavy aromatic naphtha.

5. The method of claim 1 wherein the mud washing solvent is added to the mud washing stream at about 0.1-100% solvent/gallon/minute of the mud washing stream.

6. The method of claim 5 wherein the mud washing solvent is added to the mud washing stream at about 0.1-10% solvent/gallon/minute of the mud washing stream.

7. The method of claim 6 wherein the mud washing solvent is added to the mud washing stream at about 0.5-5% solvent/gallon/minute of the mud washing stream.

8. The method of claim 1, wherein the mud wash stream comprises an oil and grease content of up to 10,000 ppm.

9. The method of claim 1, wherein the mud wash stream comprises an oil and grease content of 10,000 ppm or greater.

10. The method of claim 1 wherein the mud wash stream comprises an oil and grease content of about 1,000 and 10,000 ppm.

11. The method of claim 1, wherein the mud washing solvent is injected directly into the mud washing stream.

12. The method of claim 11 wherein the mud washing solvent is injected into the mud washing stream at about 0.1-10%/gallon/minute of the mud washing recycle stream.

13. The method of claim 1, wherein the desalter system comprises (i) a single stage desalter process, (ii) a two stage desalter process, or (iii) more than two stage desalter process.

14. The method of claim 1, wherein the desalter system comprises a mud wash pump.

15. The method of claim 14, wherein the mud washing solvent is added to the mud washing stream prior to the mud washing pump.

16. The method of claim 1, wherein the treated effluent brine comprises an oil and grease content of less than about 1000 ppm.

17. The method of claim 16, wherein the treated effluent brine comprises an oil and grease content of less than about 500 ppm.

18. The method of claim 17, wherein the treated effluent brine comprises an oil and grease content of less than about 125 ppm.

19. The method of claim 1, wherein the mud washing solvent further comprises a demulsifier composition.

20. The method of claim 19, wherein the demulsifier composition comprises a polyacrylamide, a polyol, a resin ester, a sulfonate, a succinate, a tannin, a polyamine, an alkylphenol resin ethoxylate, a non-alkoxylated phenolic resin, a hydroxy acid, a polyisoalkylsuccinimide derivative, a succinate derivative, or a combination thereof.

21. The method of claim 19, wherein less than about 50 ppm of the breaker composition is added to the mud washing solvent.

22. The method of claim 20, wherein the demulsifier composition comprises a non-alkoxylated phenolic resin, a polyisoalkylsuccinimide derivative, and/or a succinate derivative.

23. The method of claim 22, wherein greater than about 50 ppm of the breaker composition is added to the mud washing solvent.

24. A method of improving effluent brine quality, the method comprising:

(i) providing a mud washing solvent comprising a hydrocarbon having a specific gravity of less than about 1; and

(ii) adding the mud wash solvent to a mud wash stream of a desalter system, wherein the mud wash stream comprises desalter brine having an oil and grease content of at least 1,000 ppm to provide a treated effluent brine having an oil and grease content of less than about 500 ppm.

25. The method of claim 24, wherein the mud wash stream comprises an oil and grease content of up to 10,000 ppm.

26. The method of claim 24, wherein the mud wash stream comprises an oil and grease content of 10,000 ppm or greater.

27. The method of claim 24 wherein the mud wash stream comprises an oil and grease content of about 1,000 and 10,000 ppm.

28. A mud washing solvent composition, said composition comprising:

a hydrocarbon compound having a specific gravity of less than about 1.0.

29. The solvent composition of claim 28 wherein the hydrocarbon has a specific gravity of less than 0.8.

30. The solvent composition of claim 29 wherein the hydrocarbon has a specific gravity of less than 0.7.

31. The solvent composition of claim 28, wherein the hydrocarbon compounds comprise (i) kerosene, (ii) naphtha, (iii) diesel, (iv) aromatic naphtha, and/or (v) heavy aromatic naphtha.

32. The solvent composition of claim 28, wherein the hydrocarbon compound is a kerosene distillate.

33. The solvent composition of claim 28, further comprising distillate or naphtha.

34. The solvent composition of claim 28, further comprising a demulsifier composition.

35. The solvent composition of claim 34, wherein the demulsifier composition comprises a polyacrylamide, a polyol, a resin ester, a sulfonate, a succinate, a tannin, a polyamine, an alkylphenol resin ethoxylate, a non-alkoxylated phenolic resin, a hydroxy acid, a polyisoalkylsuccinimide derivative, a succinate derivative, or a combination thereof.

36. The solvent composition of claim 34 wherein less than about 50 ppm of the demulsifier composition is added to the mud wash solvent.

37. The method of claim 35, wherein the demulsifier composition comprises a non-alkoxylated phenolic resin, a polyisoalkylsuccinimide derivative, and/or a succinate derivative.

38. The method of claim 37, wherein greater than about 50 ppm of the breaker composition is added to the mud washing solvent.

Technical Field

The disclosed technology generally provides a mud washing solvent, and more particularly, a mud washing solvent and method for improving desalter effluent brine quality.

Background

Refinery desalter systems are designed to remove primarily inorganic salts from the crude prior to refining that may cause corrosion and fouling in downstream units. The desalting step is provided by adding and mixing several volume percent of fresh water with the crude oil to contact the brine and salt present in the crude oil. The salts are extracted by shearing the crude oil with water and treating the resulting oil-water emulsion with the aid of electrical, thermal and/or chemical energy. The resulting oil-water emulsion requires separation for further processing of the crude oil.

Over time, separated solids within the crude oil separated from the crude oil (such as, but not limited to, sand, silt, clay, carbonate, corrosion by-products, bitumen, and/or aggregated asphaltenes) accumulate in the bottom of the desalter vessel. Therefore, the desalter must be periodically washed to remove this buildup. Solids (typically in the form of heavy complex emulsions of water, solids, asphaltenes, bitumen and/or other hydrocarbons) are removed by "mud washing": a portion of the brine or wash water is circulated through nozzles in the bottom of the mud wash vessel to create turbulence to remove solids from the desalter effluent brine. These solids are then sent to a wastewater system.

Many desalter systems are equipped with a mud wash line designed to periodically agitate the water on the bottom of the desalter and remove the accumulation of oily solids. The water is pumped into the slurry wash header and leaves the nozzles as turbulent jets directed towards the bottom of the vessel. Due to the turbulence created in the desalter during mud washing, some of the oil and emulsion is typically entrained from the mesophase into the desalter brine. This is especially true when solids have accumulated in the bottom of the desalination apparatus reducing the available water volume and creating an uneven water distribution. Furthermore, the mud itself may contain a large amount of oil adhering to the solids, which makes the disposal of the mud more expensive and time consuming.

With the advent of new opportunities for crude oils and crude oil blends, desalters have been challenged to extract not only inorganic salts, but also excessive amounts of other components (e.g., amines, metals from metal naphthenates, and fine solid particles), while increasing crude oil blend handling flexibility to include crude oils with heavy bitumen or incompatible crude oil blends. This increased crude oil blend operating range may stress the quality of desalter effluent brine, thus increasing the risk of compliance with wastewater discharge specifications and volatile component regulations.

Accordingly, there is a need in the art for compositions and methods for improving the quality of mud wash effluent brine of refinery desalter systems.

Disclosure of Invention

The disclosed technology generally provides a mud washing solvent, and more particularly, a mud washing solvent and method for improving desalter effluent brine quality.

In one aspect of the disclosed technology, a method of improving effluent brine quality is provided. The method comprises (i) providing a mud washing solvent comprising a hydrocarbon having a specific gravity less than that of the desalter brine to be treated; and (ii) adding the mud wash solvent to a mud wash stream of a desalter system to provide a treated effluent brine.

In some embodiments, the specific gravity of the hydrocarbon is less than about 1. In some embodiments, the specific gravity of the hydrocarbon is less than about 0.7. In some embodiments, the hydrocarbons comprise (i) kerosene, (ii) naphtha, (iii) diesel, (iv) aromatic naphtha, and/or (v) heavy aromatic naphtha.

In some embodiments, the mud washing solvent is added to the mud washing stream at about 0.1-100% solvent/gallon/minute of the mud washing stream. In some embodiments, the mud washing solvent is added to the mud washing stream at about 0.1-10% solvent/gallon/minute of the mud washing stream. In some embodiments, the mud washing solvent is added to the mud washing stream at about 0.5-5% solvent/gallon/minute of the mud washing stream.

In some embodiments, the mud wash stream comprises an oil and grease content of up to 10,000 ppm. In some embodiments, the mud wash stream comprises an oil and grease content of 10,000 ppm or greater. In some embodiments, the mud wash stream comprises an oil and grease content of about 1,000-10,000 ppm.

In some embodiments, the mud washing solvent is injected directly into the mud washing stream. In some embodiments, the mud washing solvent is injected into the mud washing stream at a mud washing recycle stream of about 0.1-10% solvent/gallon/minute.

In some embodiments, the desalter system comprises (i) a single stage desalter process, (ii) a two stage desalter process, or (iii) more than two stage desalter process. In some embodiments, the desalination plant system comprises a mud wash pump. In some embodiments, the mud washing solvent is added to the mud washing stream prior to the mud washing pump.

In some embodiments, the treated effluent brine comprises an oil and grease content of less than about 1000 ppm. In some embodiments, the treated effluent brine comprises an oil and grease content of less than about 500 ppm. In some embodiments, the treated effluent brine comprises an oil and grease content of less than about 125 ppm. In some embodiments, the mud washing solvent further comprises a demulsifier composition. In some embodiments, the demulsifier composition comprises a polyacrylamide, a polyol, a resin ester, a sulfonate, a succinate, a tannin, a polyamine, an alkylphenol resin ethoxylate, a non-alkoxylated phenolic resin, a hydroxy acid, a polyisoalkylsuccinimide derivative, a succinate derivative, or a combination thereof. In some embodiments, less than about 50 ppm of the demulsifier composition is added to the mud washing solvent.

In some embodiments, the demulsifier composition comprises a non-alkoxylated phenolic resin, a polyisoalkylsuccinimide derivative, and/or a succinate derivative. In some embodiments, greater than about 50 ppm of the demulsifier composition is added to the mud wash solvent.

In yet another aspect of the disclosed technology, a method of improving effluent brine quality is provided. The method comprises (i) providing a mud washing solvent comprising a hydrocarbon having a specific gravity of less than about 1; and (ii) adding the mud wash solvent to a mud wash stream of a desalter system, wherein the mud wash stream comprises desalter brine having an oil and grease content of at least 1,000 ppm to provide a treated effluent brine having an oil and grease content of less than about 500 ppm.

In some embodiments, the mud wash stream comprises an oil and grease content of up to 10,000 ppm. In some embodiments, the mud wash stream comprises an oil and grease content of 10,000 ppm or greater. In some embodiments, the mud wash stream comprises an oil and grease content of about 1,000-10,000 ppm.

In yet another aspect of the disclosed technology, a mud washing solvent composition is provided. The composition comprises a hydrocarbon compound having a specific gravity of less than about 1.0. In some embodiments, the specific gravity of the hydrocarbon is less than about 0.8. In some embodiments, the specific gravity of the hydrocarbon is less than about 0.7.

In some embodiments, the hydrocarbon compounds comprise (i) kerosene, (ii) naphtha, (iii) diesel, (iv) aromatic naphtha, (v) heavy aromatic naphtha, and/or (vi) combinations thereof. In some embodiments, the hydrocarbon compound is a kerosene distillate. In some embodiments, the solvent composition further comprises an additional distillate or naphtha. In some embodiments, the solvent composition further comprises a demulsifier composition. In some embodiments, the demulsifier composition comprises a polyacrylamide, a polyol, a resin ester, a sulfonate, a succinate, a tannin, a polyamine, an alkylphenol resin ethoxylate, a non-alkoxylated phenolic resin, a hydroxy acid, a polyisoalkylsuccinimide derivative, a succinate derivative, or a combination thereof. In some embodiments, less than about 50 ppm of the demulsifier composition is added to the mud washing solvent.

In some embodiments, the demulsifier composition comprises a non-alkoxylated phenolic resin, a polyisoalkylsuccinimide derivative, and/or a succinate derivative. In some embodiments, greater than about 50 ppm of the demulsifier composition is added to the mud wash solvent.

Drawings

These and other features and advantages of the disclosed technology are specifically illustrated in the embodiments which will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a diagram of a mud washing system of an illustrative embodiment of the disclosed technology; and

fig. 2 provides results of an illustrative embodiment of the disclosed technology.

Detailed Description

The disclosed technology generally provides a mud washing solvent, and more specifically, provides a mud washing solvent composition and method for improving desalter effluent brine quality. Utilizing the present techniques, the use of the disclosed mud wash solvent compositions and methods in desalter applications helps to reduce the concentration of oil and grease (O & G) in desalter effluent brine (i.e., produce low oil and grease desalter effluent brine), thereby improving the mud wash effluent brine quality of refinery desalter systems. Furthermore, the present techniques may facilitate the handling and extraction of solids-laden emulsions.

The disclosed technology provides a method for improving effluent brine quality. The method comprises (i) providing a mud washing solvent; and (ii) adding the mud wash solvent to a mud wash stream of a desalter system to provide a treated effluent brine. By treating the effluent brine, harmful contaminants and other debris are removed, the removal of which is critical to avoid costly corrosion and fouling of downstream equipment. In addition, by removing complex emulsions and organics from the desalter effluent brine, the risk of non-compliance with downstream regulations, including emissions regulations and volatile emissions, in wastewater treatment plants is reduced. It also minimizes the cost of (i) separating the emulsion in a wastewater treatment plant, (ii) energy to reheat the recovered oil, and (iii) opportunity cost to reprocess the recovered oil in place of crude oil.

As shown in FIG. 1, a mud washing system 100 of a desalter system is provided. The mud wash system 100 includes a desalter vessel 102 having a mud wash header 104. The raw crude oil is provided to the mixing valve 106 prior to being introduced into the desalter vessel 102. In some embodiments, the raw crude oil comprises oil sands crude oil, heavy crude oil, crude oil blends, and/or combinations thereof.

Wash water is directed into the mud wash header 104 by a wash water pump 108 located upstream of a mud wash pump 110. In some embodiments, the desalination plant system comprises a single stage desalination plant process or a two stage desalination plant process. In some embodiments, the mud washing system is a single pass system, while in other embodiments, the mud washing system is a recirculation system.

The mud washing solvents of the present technology dissolve/solvate and/or dilute the oil and grease components in oily (i.e., problematic) brines, thus reducing the density of these contaminants. By decreasing the density, the combined/dissolved/solvated (i.e., lighter) blend of solvent and oil and grease components (which are lighter in density than water) will rise (or separate) into the oil phase more quickly within the desalter. Thus, the mud washing solvent produces cleaner brine (i.e., improved brine quality) with significantly reduced oil and grease content, as well as a reduction in emulsion layers within the desalter vessel, and results in lower processing costs.

In some embodiments, the mud washing solvent is an organic solvent. The mud washing solvent of the present technology comprises a hydrocarbon having a specific gravity less than the specific gravity of the desalter brine to be treated. In some embodiments, the mud washing solvent comprises a hydrocarbon having a specific gravity of less than about 1.0. In other embodiments, the specific gravity of the hydrocarbon is less than about 0.8, and in other embodiments, the specific gravity of the hydrocarbon is less than about 0.7. In some embodiments, the hydrocarbons comprise (i) kerosene, (ii) naphtha, (iii) diesel, (iv) aromatic naphtha, (v) heavy aromatic naphtha, and/or combinations thereof.

In some embodiments, the mud washing solvent further comprises a demulsifier composition. It should be appreciated that the presence of the emulsion breaker composition in the mud washing system as described herein may help to improve effluent brine quality, the treatment of solids laden emulsions, and compliance with downstream regulations. The combination of organic mud washing solvents with blends of different breaker compositions provides a synergistic effect to complicate emulsion treatment of oily effluent brines during mud washing.

In some embodiments, less than about 50 ppm of the demulsifier composition is added to the mud washing solvent. In some embodiments, greater than about 50 ppm of the demulsifier composition is added to the mud washing solvent. In some embodiments, the demulsifier composition includes, but is not limited to, polyacrylamides (typically cationic), polyols, resin esters, sulfonates and/or succinates, tannins, polyamines, alkylphenol resin ethoxylates, non-alkoxylated phenolic resins, hydroxyacids, amines or chemicals derived from polyisoalkylsuccinimides and/or succinates.

The mud washing solvent of the present technology is added directly to the mud washing stream. Referring to fig. 1, the mud wash solvent is added directly to the mud wash stream at location a prior to entering the mud wash pump 110. It should be understood that the mud wash solvent may be added at any point in the desalter mud wash stream or mud wash recycle stream.

In some embodiments, the slurry wash solvent is added by connecting the solvent to the desalter bottom water and/or suction inlet of the injection and/or recirculation system of the slurry wash header. In other embodiments, the slurry wash solvent is connected to the discharge of the recirculating feed pump for return to the slurry wash header.

In some embodiments, the mud wash stream of the present technology comprises a high oil and grease (O & G) content of up to 10,000 ppm. In other embodiments, the mud wash stream comprises an oil and grease (O & G) content of 10,000 ppm or greater. In some embodiments, the mud wash stream of the present technology comprises a high oil and grease (O & G) content of about 1,000-10,000 ppm.

Oil and grease content as described herein is a measure of or the presence of oil and grease contaminants such as, but not limited to, bitumen, fine solids and/or clay, oil, crude oil, and/or asphaltenes. By adding the disclosed mud washing solvents directly to the mud washing stream, a treated or improved effluent brine is provided, wherein the treated or improved effluent brine comprises reduced oil and grease content. In refineries where desalter residence time is short and therefore low oil and grease brines are difficult to produce, it is advantageous to improve (i.e., reduce) the oil and grease content of the effluent brine.

In some embodiments, the oil and grease content of the effluent brine is reduced by at least about 99%. In other embodiments, the oil and grease content is reduced by at least 50% to 99%.

In some embodiments, the mud washing solvent is added to the mud washing stream at about 0.1-100% solvent per Gallon Per Minute (GPM) of the mud washing stream. In other embodiments, the mud washing solvent is added to the mud washing stream at about 0.1-50% solvent/gallon/minute (GPM) of the mud washing stream, in other embodiments, the mud washing solvent is added to the mud washing stream at about 0.1-10% solvent/gallon/minute (GPM) of the mud washing stream, and in other embodiments, the mud washing solvent is added to the mud washing stream at about 0.5-5% solvent/gallon/minute (GPM) of the mud washing stream.

In some embodiments, the mud washing solvent is injected directly into the mud washing stream. In other embodiments, the mud wash solvent is injected directly into the desalter vessel. In some embodiments, the mud washing solvent is injected into the mud washing stream at about 0.5-5%/gallon/minute (GPM) of the mud washing recycle stream. It will be appreciated that if the oil and grease concentration in the desalter effluent brine increases, the mud wash solvent requirement will increase.

In some embodiments, when the mud wash solvent comprises a breaker composition, the breaker composition is provided to the mud wash circuit continuously or intermittently. For example, the combination of a mud washing solvent with a demulsifier composition dispersed into the mud washing header enhances sludge separation and treatment. The solvent droplets solubilize the organics into the rising solvent oil droplets to enhance the removal of the organics from the brine and to accelerate their transport to the bulk hydrocarbon phase (i.e., a liquid-liquid solvent extraction process that uses a mud wash header to deliver the solvent solution). In some embodiments, the demulsifier composition comprises from about 20% to about 100% active material in the mud washing solvent.

In other embodiments, the demulsifier composition is provided in the desalter vessel in an amount less than about 50 ppm water. By providing less than 50 ppm of the emulsion breaker composition diluent to the mud wash solvent (as compared to other ppm doses in other typical applications, such as 50-20,000 ppm), it is possible to have a separate solvent injection system, or to generate an atypical chemical diluent to eliminate excess chemicals, to have a sufficient number of solvent droplets for absorbing and transporting organics from the bottom of the desalter vessel.

In some embodiments, the treated effluent brine comprises an oil and grease content of less than about 1000 ppm. In other embodiments, the treated effluent brine comprises an oil and grease content of less than about 500 ppm. In other embodiments, the treated effluent brine comprises an oil and grease content of less than about 250 ppm, and in other embodiments, the treated effluent brine comprises an oil and grease content of less than about 125 ppm.

In particular embodiments, methods of improving effluent brine quality are provided. The method comprises (i) providing a mud washing solvent comprising a hydrocarbon having a specific gravity of less than about 1; and (ii) adding the mud wash solvent to a mud wash stream of a desalter system, wherein the mud wash stream comprises desalter brine having an oil and grease content of at least 1,000 ppm to provide a treated effluent brine having an oil and grease content of less than about 500 ppm.

Examples

The present invention is further described in the following examples, which are to be regarded as illustrative, and should not be construed to narrow the scope of the disclosed technology or to limit the scope to any particular implementation.

Figure 2 provides the results of adding a mud wash solvent composition to a mud wash stream according to the disclosed technique.

By adding the mud wash solvent as disclosed herein, the oil and grease content is reduced to less than 500 ppm on average (see fig. 2, 2018, 9 months to 2018, 12 months) compared to the effluent brine in other conventional systems (see fig. 2, 2018, 1 months to 2018, 9 months).

In the foregoing specification, the invention has been described with reference to specific embodiments thereof. It is contemplated that the mud washing solvents of the process may be used in other hydrocarbon processing operations than those specifically mentioned. While embodiments of the disclosed technology have been described, it is to be understood that the disclosure is not so limited and modifications may be made without departing from the disclosed technology. The scope of the disclosed technology is defined by the appended claims, and all devices, processes, and methods that come within the meaning of the claims, either literally or by equivalence, are intended to be embraced therein.