Dechlorination method of oil product or gas

Abstract

The invention relates to a dechlorination method of an oil product or gas, which comprises the steps of firstly introducing the chloride-containing oil product or the gas into an upstream dechlorination tank of a bed layer filled with a dechlorination agent which does not achieve the saturated absorption, and leading the oil product or the gas to pass through a downstream dechlorination tank which is series-connected with the upstream dechlorination tank and filled with the new dechlorination agent. The method can effectively utilize the absorption chlorine capacity of the dechlorination agent and lead the dechlorination agent to achieve or approach the saturated chlorine capacity, thereby greatly improving the utilization rate of the dechlorination agent.

Description

technical field [0001] The invention is a method for removing chlorine in raw materials through adsorption by using a solid dechlorination agent, in particular, a dechlorination method for oil or gas using a solid dechlorination agent. Background technique [0002] In recent years, with the improvement of oil recovery technology, people have used the means of injecting chemical agents to enhance oil recovery, and most of the chemical agents used are organic chlorides, resulting in an increase in the chlorine content of crude oil. Most of the injected chlorine is concentrated in the naphtha fraction obtained after fractionation of crude oil. In the pre-hydrotreatment stage of catalytic reforming of naphtha, organic chloride is converted into inorganic chlorine, which reacts with hydrogen to form hydrogen chloride, and then reacts with nitrogen. The generation of ammonium chloride will cause equipment blockage and corrosion during heat exchange and cooling, affecting normal pr...

AI Technical Summary

Problems solved by technology

In the practical application of this method, there are mainly the following problems: (1) Chlorine corrosion in the regeneration circuit: the reforming catalyst is a dual-functional catalyst composed of platinum-based metal function and chlorine-based acid function. During the process, some chlorine ions will be lost and need to be replenished during the oxychlorination process of regeneration. About 70% of the replenished chlorine is absorbed by the catalyst, and the rest is lost with the regeneration flue gas, which will cause corrosion to the equipment in the low temperature area of ​​the regeneration circuit

However, the Chlorsorb technology also has the following problems: (1) The increase in reforming catalyst loading increases the relative investment of the device; (2) With the increase of catalyst operation time, the chlorine holding capacity of the catalyst decreases, and the amount of chlorine injected increases, and the air is exhausted. The chlorine in the exhaust air will also gradually increase; (3) Even if this technology is used, the chlorine in the exhaust air will be reduced, but it still cannot meet the national environmental protection standards and needs to be diluted to meet the standards

In practical applications, there are many factors affecting the performance of solid dechlorination agents, which limit the dechlorination performance of dechlorination agents. On the one hand, in the dechlorination agent formulation, considering the strength requirements of the dechlorination agent, the dechlorination agent should Containing a certain amount of binder will inevitably reduce the content of active components, thereby limiting the dechlorination performance of the dechlorination agent. On the other hand, during the dechlorination process, due to the competitive adsorption of sulfur and the As the chlorine content in raw oil is getting higher and higher, the dechlorination agent should have a higher breakthrough chlorine capacity

Therefore, it is more and more difficult to improve the chlorine capacity of the dechlorination agent from the perspective of the improvement of the dechlorination agent formulation.

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