Co-production technical method for preparing ethylene and acetic acid through ethane catalytic oxidation by using water as feed gas diluent

Abstract

The invention provides a technical method for co-production of ethylene and acetic acid through ethane catalytic oxidation by using water as a feed gas diluent, and belongs to the technical field of petrochemical engineering. traditional N2 is replaced, and the method is a technical method for co-production of ethylene and acetic acid through low-temperature catalytic oxidation of ethane. Comparedwith a traditional ethane steam cracking process (the energy consumption value is 18.5 MJ / kg-C2H4), the method has the advantages that the energy consumption can be greatly reduced and is only 9.2 MJ / kg-C2H4 under better process conditions, and the energy consumption is reduced by about 50%. The novel ethylene and acetic acid co-production technology provided by the invention has the characteristics of low unit consumption of raw materials, particularly low process energy consumption, low investment, particularly low emission of wastes and pollutants and the like. Meanwhile, the product structure proportion of ethylene and acetic acid can be flexibly adjusted according to the market conditions of ethylene and acetic acid.

Description

technical field [0001] The present invention relates to the coproduction technology of the ethylene of organic chemical industry and acetic acid, particularly provides a kind of adopting water (H 2 O) Cogeneration technology of ethylene and acetic acid by catalytic oxidative dehydrogenation of ethane as feed gas diluent. Compared with the traditional ethane steam cracking technology for producing ethylene, the present invention can greatly reduce the unit consumption of raw materials, energy consumption and equipment investment, and belongs to the field of petrochemical technology. 2 O instead of the commonly used nitrogen (N 2 ) as a diluent, not only can flexibly adjust the product ratio of ethylene and acetic acid, but also can further significantly reduce energy consumption. Background technique [0002] Ethylene is the basic raw material of petrochemical industry and the pillar industry of the national economy. At present, 75% of petrochemical products are produced fr...

AI Technical Summary

Problems solved by technology

At present, ethylene is mainly produced industrially through steam thermal cracking reactions including ethane. This process usually requires a high temperature and strong endothermic reaction at 800-1100 ° C. Therefore, the process has the following problems: 1. High energy consumption

According to relevant literature [A Proceeding of the 8 th Ethylene Producer Conference: AIChE, New York] reported that the energy consumption of this process can reach 18.5MJ / kg-C 2 h 4 , and the process has been optimized for many years and is very mature, so it is extremely difficult to further reduce

2. The composition of the product is complex

The cracking reaction is a complicated free radical reaction, and there are many types of products, which will reduce the selectivity of ethylene (ethylene is generally not more than 83%) on the one hand, that is, reduce the utilization rate of raw materials, and on the other hand, it will also increase the separation difficulty of the product (especially is to produce H with a low boiling point 2 and methane)

The problem is that there are many separation equipment and high energy consumption for separation.

3. Regular removal of carbon deposits is required

The high temperature reaction will cause carbon deposits on the pipe wall, and it is necessary to stop the car regularly to remove the carbon deposits, which will inevitably affect the production efficiency

4. High equipment investment

Since the high temperature reaction requires alloy cracking furnace reactors made of special materials, the investment in equipment is relatively high