Hydrogenation alkyne removal method for methanol-to-olefin process ethylene material

Abstract

A hydrogenation alkyne removal method for a methanol-to-olefin process ethylene material is characterized in that an Fe-Co hydrogenation catalyst is used, a methanol-to-ethylene product is added to ahydrogenation reactor and undergoes selective hydrofining, a tiny amount of acetylene contained in tower top effluent obtained after alkali washing, drying, demethanation and deethanization of the methanol-to-ethylene product is adopted as a hydrogenation object, and a raw material mainly contains 99.9% or more (phi) of ethylene, 5-100 ppm of acetylene and 1-10 ppm of CO. Reaction conditions are as follows: the inlet temperature of the reactor is 30-80 DEG C, the reaction pressure is 1.5-3.0 MPa, and the space velocity is 2000-10000 h<-1>; the hydrogenation catalyst is a Fe-Co selective hydrogenation catalyst, and adopts a high temperature-resistant inorganic oxide as a carrier, the active components of the catalyst contain Fe and Co, and 100 mass% of the catalyst contains 2-6 mass% of Feand 0.5-1.5 mass% of Co; and the specific surface area of the catalyst is 10-200 m<2> / g, and the pore volume is 0.2-0.63 ml / g. The catalyst has the advantages of mild hydrogenation activity, excellentethylene selectivity, no ethylene loss and low green oil generation amount, and has a far lower cost than a precious metal Pd catalyst.

Description

technical field [0001] The invention relates to a method for hydrogenation and removal of acetylene from ethylene products in methanol to ethylene, in particular to a method for selective hydrogenation of trace acetylene by using an Fe-Co hydrogenation catalyst in the products of methanol to ethylene. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic chemical raw materials. With the development of my country's national economy, especially the development of modern chemical industry, the demand for low-carbon olefins is increasing day by day, and the contradiction between supply and demand will become increasingly prominent. So far, the important way to produce low-carbon olefins such as ethylene and propylene is still through catalytic cracking and cracking of naphtha and light diesel oil (both from petroleum). As raw materials for ethylene production, naphtha, light diesel oil, etc. Raw material resources are facing an incre...

AI Technical Summary

Problems solved by technology

This technology is to prepare intermetallic compounds under high temperature conditions for selective hydrogenation of acetylene. The conversion rate of acetylene is low and the reaction temperature is high, which is not conducive to industrial application.

And the catalyst is prepared by hot melting method, the conditions are harsh

[0031] To sum up, the selective hydrogenation of low-carbon alkynes and dienes currently mainly uses noble metal catalysts, and a lot of work has been done on the research and development of non-noble metal catalysts, but there is still a long way to go before industrial applications

Images