Dimethyl oxalate production device

Abstract

The invention discloses a dimethyl oxalate production device and relates to a chemical product production device. The device comprises a heater (1), a carbonylation reactor (2), a condenser (3), a gas-liquid separator (4) and a preheater (5), wherein an inlet of materials to be heated of the preheater (5) is communicated with a methyl nitrite conveying pipeline (61) and a CO conveying pipeline (62), an outlet of the materials to be heated of the preheater (5) is connected with an inlet of the materials to be heated of the heater (1), an outlet of the materials to be heated of the heater (1) is connected with a reaction mass inlet of the carbonylation reactor (2), a reaction mass outlet of the carbonylation reactor (2) is connected with a heating medium inlet of the preheater (5), a heating medium outlet of the preheater (5) is connected with a condensation material inlet of the condenser (3), and a condensation material gas outlet and a condensation material liquid outlet of the condenser (3) are respectively connected with an inlet of the gas-liquid separator (4). The dimethyl oxalate production device has the advantages of being simple in structure, energy-saving and consumption-reducing.

Description

technical field [0001] The invention relates to a chemical product production equipment, in particular to a dimethyl oxalate production equipment. Background technique [0002] Dimethyl oxalate is based on methanol, NO, CO and O 2 The intermediate product when preparing ethylene glycol as raw material, the molecular formula is (COOCH 3 ) 2 , the reaction steps of preparing dimethyl oxalate are as follows: [0003] 2CO+2CH 3 ONO→(COOCH 3 ) 2 +2NO [0004] The reaction is under normal pressure, the temperature is 120-140 ℃, the catalyst is Pd / Al 2 o 3 under the conditions. [0005] Such as figure 1 Shown, in the existing dimethyl oxalate production, the methyl nitrite (molecular formula is CH 3 ONO) is condensed at the top of the esterification tower, and the resulting methyl nitrite at a temperature of 0-5 °C directly enters the heater 1', and the CO gas from the outside also directly enters the heater 1', and in the heater 1' Methyl nitrate and CO enter the carbo...

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Problems solved by technology

In the above production process, the high-temperature reaction product dimethyl oxalate (liquid phase) and the unreacted raw material gas directly enter the condenser to condense after the carbonylation reaction is completed, which requires more condensate consumption, and the used condensate It also needs to cool down for recycling, which causes a waste of energy

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