阅读说明：本技术 一种甲醇制氢工艺中原料甲醇除油处理工艺 (Raw material methanol oil removal treatment process in methanol hydrogen production process ) 是由 张明明 商宝光 许胜军 宋德超 张振英 薛文杰 于 2021-04-23 设计创作，主要内容包括：本发明公开了一种甲醇制氢工艺中原料甲醇除油处理工艺,该工艺包括以下步骤：步骤一、带油的原料甲醇,通过混合器与除盐水混合,形成甲醇水溶液；步骤二、甲醇水溶液,进入粗滤滤除存在的机械杂质后,进入油水分离聚结器,油相从聚结器顶端聚集排出,除油后的甲醇水溶液进入甲醇裂解反应工艺部分。是一种流程简单、原材料成本低廉的工艺,装置结构简单,投资成本低,装置连续运行性能高,容易实现工业化生产。(The invention discloses a raw material methanol oil removal treatment process in a methanol hydrogen production process, which comprises the following steps: step one, mixing raw material methanol with oil with desalted water through a mixer to form a methanol water solution; and step two, after the methanol aqueous solution enters a coarse filter to filter out existing mechanical impurities, the methanol aqueous solution enters an oil-water separation coalescer, an oil phase is gathered and discharged from the top end of the coalescer, and the methanol aqueous solution after oil removal enters a methanol cracking reaction process part. The process has the advantages of simple flow, low raw material cost, simple device structure, low investment cost, high continuous operation performance of the device and easy realization of industrial production.)

1. A methanol oil removal treatment process for raw materials in a methanol hydrogen production process is characterized by comprising the following steps: step one, mixing raw material methanol with oil with desalted water through a mixer to form a methanol water solution; and step two, after the methanol aqueous solution enters a coarse filter to filter out existing mechanical impurities, the methanol aqueous solution enters an oil-water separation coalescer, an oil phase is gathered and discharged from the top end of the coalescer, and the methanol aqueous solution after oil removal enters a methanol cracking reaction process part.

2. The oil removing treatment process for the raw material methanol in the hydrogen production process from methanol as claimed in claim 1, wherein the raw material methanol with oil is fully mixed with desalted water through a mixer under the working pressure of 2-3 mpa.

3. The process of claim 2, wherein the methanol with oil is mixed with the desalted water thoroughly by a mixer under 2.5mpa working pressure.

4. The methanol hydrogen production process raw material methanol oil removal treatment process as claimed in claim 1, wherein the content of the raw material methanol oil with oil is 500-10000 ppm.

5. The oil removing treatment process for the raw material methanol in the hydrogen production process from methanol as claimed in claim 4, wherein the mixing mass ratio of the raw material methanol with oil to the desalted water is 3: 10-7: 10.

Technical Field

The invention relates to the technical field of methanol extraction coalescence degreasing processes, in particular to a raw material methanol degreasing treatment process in a methanol hydrogen production process.

Background

Hydrogen has a wide range of industrial uses. In recent years, the demand for pure hydrogen is rapidly increased due to rapid development of hydrogen peroxide prepared by a fine chemical method and an anthraquinone method, powder metallurgy, grease hydrogenation, forestry and agricultural product hydrogenation, bioengineering, petroleum refining hydrogenation, hydrogen fuel cleaning automobiles and the like. For areas without convenient hydrogen sources, if the traditional method for producing hydrogen by separating and producing gas by using petroleum, natural gas or coal as raw materials needs huge investment, "being equivalent to half synthetic ammonia", is only suitable for large-scale users. The hydrogen can be conveniently prepared by electrolyzing water for medium and small users, but the energy consumption is very large, the power consumption of hydrogen per cubic meter reaches 6 ℃, the hydrogen purity is not ideal, the impurities are more, and the scale is limited, so in recent years, a plurality of manufacturers for preparing hydrogen by electrolyzing water are technically improved, and a new process route for preparing hydrogen by converting methanol steam is changed. The methanol is convenient to transport, the purity of hydrogen production by methanol hydrogen production is high, the construction cost is low, the energy consumption is low, and the like; therefore, a large number of domestic oil refining chemical enterprises adopt methanol hydrogen production devices as hydrogen supply of the whole plant, and the total number of the devices exceeds 60. Most of the methanol is transported by a return oil tank truck, little residual oil in the special methanol tank truck is carried into the methanol and is carried into the existing methanol hydrogen production device, the diesel oil is slightly soluble in the methanol, and the diesel oil is difficult to separate by using a conventional method. The methanol with oil enters the cracking reactor, which affects the activity and stability of the catalyst, reduces the service life of the cracking catalyst, and generates hydrocarbons containing pungent odor such as benzene, ethylene oxide and the like under the action of the copper catalyst to be taken out along with the cracking gas, thereby aggravating the generation of peculiar smell and polluting the environment. And the oil phase enters the VPSA system along with the pyrolysis gas, is attached to the surface of the adsorbent, cannot be desorbed, gradually loses the adsorption capacity, and reduces the service life and the adsorption strength of the adsorbent.

In conclusion, the methanol with oil has obvious influence on the catalyst and the adsorbent of the device, generates peculiar smell to pollute the environment, and is imperative in removing oil.

Disclosure of Invention

The purpose of the invention is as follows: in order to prevent the catalyst and the adsorbent of the methanol hydrogen production device from being influenced by the oil content of the raw material methanol, the raw material methanol oil removal treatment process in the methanol hydrogen production process is provided.

The invention comprises the following steps:

a methanol oil removal treatment process for raw materials in a methanol hydrogen production process comprises the following steps: step one, mixing raw material methanol with oil with desalted water through a mixer to form a methanol water solution; and step two, after the methanol aqueous solution enters a coarse filter to filter out existing mechanical impurities, the methanol aqueous solution enters an oil-water separation coalescer, an oil phase is gathered and discharged from the top end of the coalescer, and the methanol aqueous solution after oil removal enters a methanol cracking reaction process part.

The preferable technical scheme is as follows: the raw material methanol with oil is fully mixed with the desalted water through a mixer under the working pressure of 2-3 mpa.

According to the preferred technical scheme, the raw material methanol with oil is fully mixed with the desalted water through a mixer under the working pressure of 2.5 mpa.

The preferable technical scheme is that the content of the raw material methanol oil with oil is 500-10000 ppm.

According to the preferable technical scheme, the mixing mass ratio of the raw material methanol with oil to the desalted water is 3: 10-7: 10.

Compared with the prior art, the invention has the following beneficial effects: the methanol extraction oil removal process combines a mixer and a coalescer (including rough filtration protection) through careful design, and has the following obvious advantages:

1) the conventional methanol hydrogen production process flow is basically not changed, but the full mixing and coalescence separation of the methanol water solution are added, and the change of the process flow is small. The whole processing flow of the original main body production device is not influenced.

2) The process combination of the mixer and the coalescer has the characteristics of rapid dissolution and extraction, and the production cost is low. The filter element is replaced for 1 time in 2-5 years, and the maintenance is convenient.

3) The invention is only provided with the mixer, the conventional rough filtration protection filter and the conventional oil-water separation coalescer, which are common pressure vessels and equipment in the chemical industry, and has no special equipment technology, low purchasing and construction cost, simple and convenient operation and no technical barrier.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

Detailed Description

The process flow is as follows; methanol is mixed from the raw material methanol pump → demineralized water → methanol-water mixer → coarse filtration protector → deoiling coalescer → to reactor:

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the process flow of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

1) The external raw material methanol of the device contains dissolved oil phase, and the content of the raw material methanol oil is 10000 ppm; boosting the pressure to be more than 2.5mpa by a methanol pump, and mixing the pressure with desalted water according to the mass ratio of methanol to desalted water of 3: 10;

2) and the merged methanol water enters a mixer for fully mixing to form a uniform methanol water solution. Methanol is completely dissolved in water, but the oil phase is not mutually soluble with water, so under the action of water, the oil phase can only be uniformly suspended in the methanol aqueous solution in an oil drop form, cannot be dissolved and is in a turbid state. And conditions are created for the next step of coalescence removal.

3) In order to prevent the methanol aqueous solution from carrying mechanical impurities, the turbid methanol aqueous solution with oil drops enters a rough filter to filter out the mechanical impurities.

4) The methanol aqueous solution after filtering mechanical impurities enters a coalescer, and suspended oil drops are coalesced into large oil drops which are gathered on the upper part of the methanol aqueous solution to be removed.

5) Most of the oil phase of the treated methanol aqueous solution is removed, the oil content is reduced to below 50ppm, and the aqueous solution is in a completely clear turbine state.

Example 2

1) The external raw material methanol of the device contains dissolved oil phase; the content of the raw material methanol oil is increased to more than 2.5mpa by a methanol pump, and the raw material methanol oil is mixed with desalted water according to the mass ratio of the methanol to the desalted water of 7: 10;

2) and the merged methanol water enters a mixer for fully mixing to form a uniform methanol water solution. Methanol is completely dissolved in water, but the oil phase is not mutually soluble with water, so under the action of water, the oil phase can only be uniformly suspended in the methanol aqueous solution in an oil drop form, cannot be dissolved and is in a turbid state. And conditions are created for the next step of coalescence removal.

3) In order to prevent the methanol aqueous solution from carrying mechanical impurities, the turbid methanol aqueous solution with oil drops enters a rough filter to filter out the mechanical impurities.

4) The methanol aqueous solution after filtering mechanical impurities enters a coalescer, and suspended oil drops are coalesced into large oil drops which are gathered on the upper part of the methanol aqueous solution to be removed.

5) Most of the oil phase of the treated methanol aqueous solution is removed, the oil content is reduced to below 50ppm, and the aqueous solution is in a completely clear turbine state.

Example 3

1) The external raw material methanol of the device contains dissolved oil phase, and the content of the raw material methanol oil is 6000 ppm; boosting the pressure to be more than 2.5mpa by a methanol pump, and mixing the pressure with desalted water according to the mass ratio of the methanol to the desalted water of 5: 10;

2) and the merged methanol water enters a mixer for fully mixing to form a uniform methanol water solution. Methanol is completely dissolved in water, but the oil phase is not mutually soluble with water, so under the action of water, the oil phase can only be uniformly suspended in the methanol aqueous solution in an oil drop form, cannot be dissolved and is in a turbid state. And conditions are created for the next step of coalescence removal.

3) In order to prevent the methanol aqueous solution from carrying mechanical impurities, the turbid methanol aqueous solution with oil drops enters a rough filter to filter out the mechanical impurities.

4) The methanol aqueous solution after filtering mechanical impurities enters a coalescer, and suspended oil drops are coalesced into large oil drops which are gathered on the upper part of the methanol aqueous solution to be removed.

5) Most of the oil phase of the treated methanol aqueous solution is removed, the oil content is reduced to below 50ppm, and the aqueous solution is in a completely clear turbine state.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.