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Evaporation system and production process of dimethylformamide

A technology of dimethylformamide and evaporation system, which is applied in the field of production technology to achieve the effects of saving production costs, increasing production and reducing consumption

Active Publication Date: 2020-07-28
LIAOCHENG YANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And when adopting above-mentioned production process to carry out production, sodium methoxide is easily soluble in water and can make product crystallize and decompose in the system, introduce impurity again

Method used

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  • Evaporation system and production process of dimethylformamide

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Effect test

Embodiment 1

[0046] In this embodiment, a kind of evaporation system of dimethylformamide is provided, its structure is as attached figure 1 As shown, the evaporation system includes a separator 1 , a first circulation pump 2 , a second circulation pump 3 , a filter 4 and a heater 6 . The DMF material flows back into the separator 1 after passing through the separator 1 , the first circulating pump 2 , the filter 4 and the heater 6 .

[0047] The separator 1 is provided with a liquid level high and low limit alarm, the liquid level is controlled at 1.2-2.5m, the internal temperature is about 173°C, and the pressure is controlled at about 0.08MPa. The separator 1 receives the DMF crude material from the DMF synthesis tower 6, and under the action of temperature and pressure, the DMF crude material is evaporated and separated for the first time. Distillation tower, enter the DMF purification of next operation.

[0048] The DMF in the liquid phase flows out from the lower port of the separa...

Embodiment 2

[0057] In the present embodiment, the production process of the evaporation system of dimethylformamide described in Example 1 is provided, and the production process comprises the following steps:

[0058] (1) Check the opening of the valve and the sealing of the filter 4 to ensure the tightness of the evaporation system;

[0059] (2) Open the valves of DMF synthesis tower 6 and heater 5. After the material in the separator 1 rises to 2.3m, temporarily close the DMF synthesis tower 6 discharge valves, open the second circulation pump 3 inlet valves, and open the circulation The pump outlet enters the valve of the filter a and the valve of the filter a outlet to the evaporation heater, and then opens the gas phase valve of the evaporation heater to ensure that the circulation passage valve of the evaporation filter is unblocked, and then starts the evaporation circulation pump a according to the operating procedures of the canned pump Or b, establish a system loop;

[0060] (...

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PUM

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Abstract

The invention particularly relates to an evaporation system and a production process of dimethylformamide. The dimethyl formamide prepared by taking carbon monoxide and dimethylamine as raw materialsunder the catalytic action of methanol / sodium methoxide has the advantages of good product quality and low cost, but sodium methoxide is easy to crystallize when being dissolved in water, and can catalyze DMF (Dimethyl Formamide) to generate inverse reaction in an evaporation process to generate dimethylamine. The invention provides a DMF evaporation system suitable for the production mode and a production process. The production process comprises the following steps of: crude DMF of a DMF synthesis tower enters a separator for preliminary concentration, forced circulation with a filter is carried out in two paths, water is added into one path at an inlet of a second circulating pump, normal operation of an evaporation circulating pump is ensured by adding water, and the other path is usedfor inhibiting reverse reaction of DMF. And the first circulating pump of the other path plays a role in filtering and discharging system salt mud. According to the production process, the DMF operation period can be effectively prolonged, and the yield is increased.

Description

technical field [0001] The invention belongs to the technical field of chemical production methods, specifically relates to an evaporation system for dimethylformamide, and provides a production process using the evaporation system, which has the technical effect of improving the production cycle of dimethylformamide. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Dimethylformamide (DMF) is a good solvent for many organic and inorganic substances, so it is often used as a reaction catalyst or co-catalyst in the reaction to increase the yield of reaction products and reduce the formation rate of by-products. The DMF production process uses anhydrous dimethylamine and carb...

Claims

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Application Information

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IPC IPC(8): B01D1/00B01D1/30
CPCB01D1/0011B01D1/0064B01D1/0082B01D1/30B01D1/305
Inventor 王德民李玉超
Owner LIAOCHENG YANSHAN NEW MATERIAL TECH