Process and system for preparing alpha-olefin by catalytic conversion of fatty acid ester

Abstract

The invention relates to the technical field of fatty acid ester conversion, in particular to a process and system for preparing alpha-olefin through catalytic conversion of fatty acid ester. The process comprises fatty acid ester hydrogenation, fatty alcohol separation, fatty alcohol dehydration and alpha-olefin separation, the process expands the source of raw materials for synthesizing alpha-olefin, the product composition is simple, and the subsequent separation difficulty is low. The system comprises a fatty acid ester hydrogenation unit, a fatty alcohol separation unit, a fatty alcohol dehydration unit and an alpha-olefin separation unit, which are connected in sequence. According to the process and the system, through reasonable circulation arrangement of unreacted substances (circulation of a small part of unreacted hydrogen and oxygen-containing substances), generation of the oxygen-containing substances is reduced, and meanwhile, low emission and even zero emission of the oxygen-containing substances are realized.

Description

technical field [0001] The invention relates to the technical field of fatty acid ester conversion, in particular to a process and system for preparing α-olefins by catalytic conversion of fatty acid ester. Background technique [0002] Linear α-olefins usually refer to C4 and above linear terminal olefins. They are an important class of organic chemical raw materials that have developed rapidly in the past 30 years. Since the industrialization of ethylene oligomerization to produce α-olefins in the 1990s , Its application fields continue to expand, and comonomers are widely used, synthetic lubricant base oils, surfactants, plasticizers, fungicides and emulsifiers and other chemical products. [0003] With the rapid development of the world economy, the α-olefin market is still showing a trend of rapid development, and some new devices are still under construction. In 2016, the world's main production capacity of α-olefins was 5.56 million tons, and its consumption was 5.37...

AI Technical Summary

Problems solved by technology

This method obtains C4-30 linear α-olefins, the product composition is more complex, and the separation process is longer

[0008] (3) Internal olefin isomerization method: there is a problem that the composition of the product is relatively complex and the subsequent separation is relatively difficult

[0009] (4) Alkane dehydrogenation method: both domestic and foreign technologies have the problems of low single-pass conversion rate and short lifespan (such as: UOP technology, Xconv, s=10-15%, lifespan cat.=~40 days). There is a problem of high energy consumption in the separation of the reacted alkane feedstock and α-olefins

[0018] To sum up, so far, there are still few techniques for directly synthesizing high-carbon α-olefins using typical raw materials such as vegetable oils and / or animal oils and biological oils.

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