Regeneration process and regeneration device system of methyl nitrite in process for preparation of ethylene glycol from synthesis gas

Abstract

The invention relates to a regeneration process and a regeneration device system of methyl nitrite in a process for preparation of ethylene glycol from a synthesis gas, the regeneration process comprises the following steps: (1) methyl nitrite regeneration, to be more specific, a liquid containing methanol and nitric acid and a gas containing nitrogen oxides from a methyl nitrite synthesis reactor are introduced into a methyl nitrite regeneration tower for reaction to obtain methyl nitrite; and (2) methyl nitrite stripping recovery, to be more specific, a methyl nitrite regeneration tower kettle components and a gas or gases selected from one or more of N2, CO2, CH4, CO and the nitrogen oxides are introduced into a methyl nitrite regeneration stripping tower for stripping for recovery of the methyl nitrite dissolved in the methanol. The regeneration process reduces the consumption of the nitric acid in the process for preparation of the ethylene glycol from the synthesis gas, the nitric acid produced by side reaction is economically and efficiently recovered, and the problem that a methanol solution dissolves the methyl nitrite can be solved.

Description

technical field [0001] The invention relates to the technical field of synthesis gas to ethylene glycol process, in particular to a methyl nitrite regeneration process and regeneration device system in the synthesis gas to ethylene glycol process. Background technique [0002] In the existing industrial technology, the synthesis gas to ethylene glycol process generally uses nitric oxide, oxygen and methanol to react to form methyl nitrite, and then reacts methyl nitrite with carbon monoxide to form the intermediate product dimethyl oxalate, and then undergoes hydrogenation Ethylene glycol product is obtained. Since nitric oxide is regenerated when methyl nitrite reacts with carbon monoxide to generate dimethyl oxalate, and the reaction selectivity on the palladium metal catalyst is very high, it can be considered theoretically that no nitric oxide gas is consumed for the entire process system . However, in the reaction system for the synthesis of methyl nitrite, nitric oxi...

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Problems solved by technology

However, because of the fully mixed flow characteristics of the tank reactor, the concentration of nitric acid in the reactor is the same as the concentration of nitric acid at the outlet, and high-concentration nitric acid is beneficial to the generation of methyl nitrite. If it is lowered enough, it is necessary to adopt the form of multiple tank reactors connected in series, coupled with the limitation of equipment manufacturing, the processing capacity of the tank reactor is certain, if the method in the patent is actually applied to the production of methyl nitrite For regeneration, a large number of large-capacity tank reactors are required, which is difficult to operate, occupies a large area, and has low economic efficiency.

[0007] It can be seen from the above that the current industrial attempt to optimize the design of the esterification synthesis reactor itself is not ideal to reduce the effect of side reactions to generate nitric acid, and the treatment plan for dissolving a part of methyl nitrite in methanol solution also has certain defects.

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