Processing method for isomerization of n-butene in after-etherification C4

Abstract

The invention discloses a processing method for isomerization of n-butene in after-etherification C4. The processing method comprises: (1) raw material pretreatment, wherein the by-product after-etherification C4 of a MTBE device passes through a filter and coalesce to pre-treat the solid impurities and the water in the raw material; (2) isomerization reaction unit, wherein the n-butene in the after-etherification C4 is isomerized, the pre-treated raw material is pressurized, the pressurized raw material enters a two-stage heat exchanger, the heat exchange material enters a first isomerizationreactor, the obtained material passes through an air cooler and an aftercooler, and enters a product buffer tank, and the obtained product is pumped to the MTBE device as the raw material for producing MTBE; and (3) catalyst regeneration, wherein the hydrocarbon on a catalyst is cleaned with nitrogen, and nitrogen heating is performed to achieve the catalyst regeneration. According to the presentinvention, with the processing method, the regeneration unit can be completely utilized, the equipment investment cost can be reduced, the high temperature reaction product and the raw material are subjected to heat exchange, the energy saving effect can be achieved, the repeated utilization of the catalyst can be achieved, the influence of impurities on the catalyst can be reduced, and the catalyst loss during the operation and regeneration can be reduced.

Description

technical field [0001] The invention belongs to the processing method of the by-product ether C4 of the MTBE unit of the oil refinery, in particular to a processing method of the isomerization of n-butene in the Ether C4. Background technique [0002] The country fully implemented the National V gasoline standard on January 1, 2017, which requires gasoline olefin content <24%, sulfur content <10ppm; MTBE is a high-octane gasoline component, and its basic octane number RON: 118, MON: 100, is an excellent gasoline high-octane additive and antiknock agent. MTBE and gasoline can be miscible in any proportion without stratification, and have a good blending effect when blending with gasoline components, and the blended octane number is higher than its net octane number. MTBE has a relatively high oxygen content and can significantly improve vehicle exhaust emissions. The by-product ether C4 of MTBE plant is mainly used as civil natural gas, and the economic benefits are l...

AI Technical Summary

Problems solved by technology

However, it is necessary to purchase fresh catalysts and establish a complete set of isomerization-regeneration equipment, which requires high equipment investment costs; regular purchases and replacements of catalysts are required, resulting in high operating costs

However, the scale of MTBE units in different refineries is different, and the output of C4 after ether and the content of n-butene in the by-products produced are also different. Therefore, relatively unclear economic benefits can be obtained with relatively high investment. The existing butene isomerization technology not the best choice

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