Two-stage fluidized bed CO dehydrogenation purification reaction technology and used catalyst

Abstract

The invention discloses a two-stage fluidized bed CO dehydrogenation purification reaction technology and a used catalyst. The reaction technology is as follows: two fluidized beds are in up-and-down arrangement, a reaction gas is fed in from the bottommost of a reactor, and enters an upper fluidized bed reactor for reaction, after heat exchange condensation of the gas reacted in the upper fluidized bed reactor, a gas phase component is used as a carbonylation reaction raw material gas, and a liquid component enters a storage tank. A catalyst used in a lower fluidized bed is PdAgClx / TiO2 (x = 1-3), can be used for selective oxidation of H2 at low temperature to reduce or avoid consumption of CO raw material gas, the H2 in the raw material gas CO is reduced to 5000ppm or less after reaction in the lower fluidized bed, a catalyst used in an upper fluidized bed is PdO-Ag2O / TiO2, can be used for oxidatively transform the H2 as much as possible at high temperature, and the H2 in the CO raw material gas is reduced to 50ppm or less after reaction in the upper fluidized bed. The method can effectively solve the industrial enlargement problem of raw material gas CO oxidation dehydrogenation process in coal-based ethylene glycol synthesis technology.

Description

technical field [0001] The invention relates to a two-stage fluidized bed technology, in particular to the application of the two-stage fluidized bed CO in the dehydrogenation purification reaction and the catalyst used. Background technique [0002] Oxylation is a type of reaction in which carbonyl and other groups are introduced into organic compound molecules to become oxygen-containing compounds. It can also be called carbonylation reaction (Carbonylation). 2 ) react with olefins, or alkynes, or organic compounds such as alcohols or halogenated hydrocarbons to produce acetic acid, acetic anhydride, oxalate, ethylene glycol, dimethyl carbonate, polycarbonate, dimethylformamide, phosgene , TDI, MDI, formic acid, etc., is one of the most effective channels for a wide range of fine chemicals. Because many reactions in oxo synthesis belong to "atom economy" type reactions, which achieve full utilization of resources and are environmentally friendly, some traditional catalyti...

AI Technical Summary

Problems solved by technology

[0008] Due to CO, H 2 and O 2 The catalytic combustion reaction is a strong exothermic reaction, and the reaction heat needs to be removed in time, but almost all reactors in industrial devices are tubular fixed-bed reactors, and the heat removal effect of fixed-bed reactors is average. The temperature in the device is easy to fly, so that the space velocity of the oxidative dehydrogenation reaction is limited, and the space velocity is generally controlled at 5000h -1 Next, the strong exothermic reaction also limits the volume expansion of a single reactor. In the current industrialized coal-to-ethylene glycol technology, multiple sets of reactors are connected in series and parallel to control the heat of reaction.

Although the disclosed fluidized bed patent CN201410327115.1 has greatly improved the reaction space velocity, O 2 to H 2 The selectivity of the

[0009] In order to solve the heat transfer of the oxidative dehydrogenation purification process, the reactor is not easy to be over-scaled, and the O 2 to H 2 Insufficient selectivity of raw material gas caused by excessive consumption of CO, etc., the development of a two-stage fluidized bed and its catalyst technology is of great significance for the development of coal-to-ethylene glycol technology

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