Method for producing dichloroethane by comprehensively utilizing refined dry gas

Abstract

The invention provides a method for producing dichloroethane by comprehensively utilizing refined dry gas. The method comprises the following steps of: carrying out purification and enrichment on refined dry gas to obtain ethylene-rich dry gas with the relatively high ethylene content, and respectively recycling hydrogen and other effective components in the dry gas; sequentially introducing the ethylene-rich dry gas and chlorine gas into a pipe reactor and a bubble tower after respectively mixing the ethylene-rich dry gas and the chlorine gas with the circulating dichloroethane mother solution, and reacting to generate dichloroethane; and introducing tail gas of a chlorination reaction into a refined dry gas enrichment system to be reused. With the adoption of the method, the dichloroethane can be produced by chloridizing the refined dry gas, the comprehensive utilization ratio of the ethylene in the refined dry gas reaches above 90%, meanwhile, the hydrogen, C1 and C3+ in the dry gas are adequately utilized, the weight concentration of the produced dichloroethane can reach above 95%, and the purified chloridized tail gas can still be taken as raw materials for fuel gas or ethane / propane cracking; a circular economy way for producing the dichloroethane by comprehensively utilizing the refined dry gas is provided, and the effective components in the refined dry gas are adequately utilized.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of refinery dry gas and production of dichloroethane. Background technique [0002] Refining dry gas is the waste tail gas produced in the process of petroleum refining, the main components include C 2 h 4 、C 2 h 6 、CH 4 、H 2 、C 3 h 6 、C 3 h 8 , CO, CO 2 and other components. So far, this part of petroleum resources is mainly used as fuel, and its main components such as ethylene, ethane, hydrogen and carbon 3 and above (C3+) components have not been efficiently utilized, resulting in a waste of resources and a large amount of CO emissions. 2 , with the rapid development of my country's petroleum industry, the annual output of catalytic dry gas is very considerable. Recycling and utilization of effective components in refining dry gas can not only obtain high-purity single components, but also further produce high value-added Chemical products form a stepped utilization of diffe...

AI Technical Summary

Problems solved by technology

Before participating in the reaction, the dry gas is not dispersed in advance, and directly reacts with the chlorine-dissolved dichloroethane, resulting in uneven mixing of the dry gas and chlorine gas, which may easily lead to a decrease in the conversion rate of ethylene and the formation of side reactions

This patent also does not describe the treatment of chlorination reaction tail gas. Gases such as ethylene and ethane contained in chlorination reaction tail gas are not recycled, which will reduce the utilization rate of ethylene and reduce the economical efficiency of this technical solution. At the same time, the patent There is no research on the influence of components other than ethylene in the dry gas on the direct chlorination reaction of ethylene, and no treatment measures for catalyst deactivation caused by impurities such as hydrogen sulfide have been proposed. Therefore, although the conversion rate of ethylene in the direct chlorination process is greater than 95 %, but the comprehensive utilization rate of ethylene is not considered

[0010] In addition, the above-mentioned background technologies have not provided an economical solution for the treatment of chlorinated tail gas. Because chlorinated tail gas cannot be directly used as fuel, if high-temperature incineration treatment will cause waste of resources and increase additional costs, while low-temperature combustion treatment will produce secondary Toxic substances

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