阅读说明：本技术 一种利用硫代硫酸钠脱除油品中氯化物的方法 (Method for removing chloride in oil product by using sodium thiosulfate ) 是由 蒋成祥 于 2019-10-08 设计创作，主要内容包括：本发明公开了一种利用硫代硫酸钠脱除油品中氯化物的方法,包括以下步骤：S1、原油加入水进行混合,缓速均匀搅拌,溶解原油中的盐类；S2、继续注入破乳剂和硫代硫酸钠,搅拌30min,得到原料油；S3、将原料油放入蒸馏装置,将蒸馏装置加热,利用高温和水蒸气水解氯化物,水解后继续加热至120℃～150℃,在此温度下进行油水分离,可以有效地脱除液体油品中的有机氯化物,和固定杂质。并且脱氯反应所需温度更低、时间更短,更具有工业使用价值。(the invention discloses a method for removing chloride in oil products by using sodium thiosulfate, which comprises the following steps: s1, adding water into the crude oil, mixing, slowly stirring uniformly, and dissolving salts in the crude oil; s2, continuously injecting a demulsifier and sodium thiosulfate, and stirring for 30min to obtain raw oil; s3, putting the raw oil into a distillation device, heating the distillation device, hydrolyzing chloride by using high temperature and water vapor, continuously heating to 120-150 ℃ after hydrolysis, and performing oil-water separation at the temperature, thereby effectively removing organic chloride and fixed impurities in the liquid oil product. And the temperature required by the dechlorination reaction is lower, the time is shorter, and the method has industrial use value.)

1. a method for removing chloride in oil products by using sodium thiosulfate is characterized in that: the method comprises the following steps:

s1, adding water into the crude oil, mixing, slowly stirring uniformly, and dissolving salts in the crude oil;

s2, continuously injecting a demulsifier and sodium thiosulfate, and stirring for 30min to obtain raw oil;

S3, putting the raw oil into a distillation device, heating the distillation device, hydrolyzing chloride by using high temperature and water vapor, continuously heating to 120-150 ℃ after hydrolysis, carrying out oil-water separation at the temperature, and removing the chloride and fixed impurities in the raw oil.

2. The method for removing chloride in oil products by using sodium thiosulfate as claimed in claim 1, which is characterized in that: the mass ratio of the crude oil to the water is 1:3, and the stirring mode is magnetic slow uniform stirring.

3. The method for removing chloride in oil products by using sodium thiosulfate as claimed in claim 1, which is characterized in that: the demulsifier is an FC series demulsifier or a GT series demulsifier; the main components of the FC series demulsifier are polyoxypropylene, polyoxyethylene ether and polyoxypropylene ester compounded high molecular weight active agents, and the main product models are FC9301, FC9601, FC961, FC991 and the like; the GT series demulsifier mainly comprises polyoxypropylene, polyoxyethylene ether and polyoxypropylene ester compounded high molecular weight active agents, and the main product models comprise GT940, GT922, GT921 and the like.

4. The method for removing chloride in oil products by using sodium thiosulfate as claimed in claim 1, which is characterized in that: the synthetic method of the sodium thiosulfate comprises the steps of reacting a soda solution with sulfur dioxide gas, adding caustic soda for neutralization, adding caustic soda for removing impurities, filtering, dissolving sulfur powder in a hot sodium sulfite solution for reaction, filtering, removing impurities, filtering again, adding caustic soda for alkali treatment, concentrating, filtering, crystallizing, centrifugally dewatering and screening to obtain the finished product of the sodium thiosulfate.

5. The method for removing chloride in oil products by using sodium thiosulfate as claimed in claim 1, which is characterized in that: and in the step S2, the mass ratio of the sodium thiosulfate to the raw oil is 1: 20.

6. The method for removing chloride in oil products by using sodium thiosulfate as claimed in claim 1, which is characterized in that: the distillation device in the step S3 is a real boiling point distillation device.

7. The method for removing chloride in oil products by using sodium thiosulfate as claimed in claim 1, which is characterized in that: the distillation temperature is 100 ℃ to 130 ℃, the distillation time is 2.5h, and the oil-water separation temperature is 120 ℃ to 150 ℃.

Technical Field

The invention belongs to the technical field of oil product dechlorination, and particularly relates to a method for removing chloride in an oil product by using sodium thiosulfate.

Background

The chlorine element contained in the crude oil generally exists in two forms, namely organic chlorine existing in a chloralkane structure and inorganic chloride formed with alkaline earth metal. With the development of oil refining technology, the quality concentration of inorganic salt in crude oil can be reduced to below 3mg/L by using an electric desalting process, but the phenomena of corrosion of chlorine to oil refining equipment and catalyst poisoning are still serious, and with the deterioration of crude oil produced for the second time and the third time in oil fields, certain amount of chlorine-containing compounds are added in the exploitation processes of oil fields outside China, Liaohe oil field in China, Jidong oil field and the like, so that the content of organic chloride in the crude oil is gradually increased. Because the electro-desalting can only remove inorganic chloride ions, although the salt content in the crude oil after the electro-desalting is low, the organic chloride content and the chloride ion content in the crude oil are still high, which indicates that the conventional dechlorination process measures can hardly meet the requirement of corrosion prevention of an industrial production device, and therefore, the technical development of the removal of the organic chloride in the crude oil is necessary. At present, no efficient method for removing organic chloride in crude oil exists.

Disclosure of Invention

The invention mainly solves the technical problem of providing the method for removing the chloride in the oil product by using the sodium thiosulfate, and the method has good dechlorination effect and simple equipment.

In order to solve the technical problems, the invention provides a method for removing chloride in oil products by using sodium thiosulfate, which is characterized by comprising the following steps: the method comprises the following steps:

S1, adding water into the crude oil, mixing, slowly stirring uniformly, and dissolving salts in the crude oil;

S2, continuously injecting a demulsifier and sodium thiosulfate, and stirring for 30min to obtain raw oil;

s3, putting the raw oil into a distillation device, heating the distillation device, hydrolyzing chloride by using high temperature and water vapor, continuously heating to 120-150 ℃ after hydrolysis, carrying out oil-water separation at the temperature, and removing the chloride and fixed impurities in the raw oil.

Further, the mass ratio of the crude oil to the water is 1:3, and the stirring mode is magnetic slow uniform stirring.

The demulsifier is an FC series demulsifier or a GT series demulsifier; the main components of the FC series demulsifier are polyoxypropylene, polyoxyethylene ether and polyoxypropylene ester compounded high molecular weight active agents, and the main product models are FC9301, FC9601, FC961, FC991 and the like; the GT series demulsifier mainly comprises polyoxypropylene, polyoxyethylene ether and polyoxypropylene ester compounded high molecular weight active agents, and the main product models comprise GT940, GT922, GT921 and the like.

The sodium thiosulfate is synthesized through the reaction between sodium carbonate solution and sulfur dioxide gas, the neutralization with caustic soda, the elimination of impurity with caustic soda, filtering, dissolving sulfur powder in hot sodium sulfite solution, reaction, filtering, elimination of impurity, filtering, addition of caustic soda for alkali treatment, concentration, filtering, crystallization, centrifugal dewatering and screening.

In step S2, the mass ratio of sodium thiosulfate to the feedstock oil is 1: 20.

In step S3, the distillation apparatus is a real boiling point distillation apparatus.

further, the distillation temperature is 100-130 ℃, the distillation time is 2.5h, and the oil-water separation temperature is 120-150 ℃.

The invention has the beneficial effects that: the method for removing the chloride in the oil product is simple, the equipment is simple, the denitrification effect is good, the organic chlorine and the inorganic chlorine in the oil product can be effectively removed, and the industrial application prospect is very wide.

And the desulfurization cost is low, the stability is good, almost no residue exists in the oil product, and the repeated utilization rate is high.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.