A kind of evaporation system and production process of dimethylformamide
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A technology of dimethylformamide and evaporation system is applied in the field of production technology to achieve the effects of improving operation cycle, good market promotion significance and increasing output
Active Publication Date: 2022-03-04
LIAOCHENG YANSHAN NEW MATERIAL TECH
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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
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Embodiment 1
[0046] In this embodiment, an evaporation system of dimethylformamide is provided, and the structure is attached. figure 1 As shown, the evaporation system includes a separator 1, a first circulating pump 2, a second recirculating pump 3, a filter 4, and a heater 6. The DMF material is returned to the separator 1 after the separator 1, the first circulation pump 2, the filter 4, and the heater 6.
[0047] The separator 1 is provided with a liquid level high and low alarm, and the liquid level is controlled at 1.2-2.5m, and the internal temperature is about 173 ° C, and the pressure is controlled at 0.08 MPa. The separator 1 receives the DMF coarse material from the DMF synthesis tower 6, and the DMF coarse is first evaporated for the first time, and the DMF in the gas phase is entered into the initial. Distillation column, the DMF pure to the next step.
[0048] The DMF in the form of the liquid phase flows out from the separator to the first circulation pump 2, and passes through...
Embodiment 2
[0057] In this embodiment, the production process of the evaporation system of the dimethylformamide described in Example 1, the production process includes the following steps:
[0058] (1) Check the valve opening degree and filter 4 sealing, and ensure the sealing of the evaporation system;
[0059] (2) Open the Valve of the DMF synthesis tower 6, the heater 5, when the material in the separator 1 rises to 2.3m, temporarily close the DMF synthesis tower 6 discharge valve, open the second cycle pump 3 import valve, open the cycle Pump outlet into the valve and filter A of the filter A outlet to the valve of the evaporation heater, then open the gas phase valve of the evaporation heater to ensure that the evaporation of the circulating circulation passage valve is smooth, then the evaporation circulation pump is turned on according to the operation procedure of the shielding pump. Or b, establish a system cycle;
[0060] (3) Take the evaporation circulation pump C to ensure smooth...
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Abstract
The invention specifically relates to an evaporation system and a production process of dimethylformamide. Using carbon monoxide and dimethylamine as raw materials to prepare dimethylformamide under the catalysis of methanol / sodium methoxide has the advantages of good product quality and low cost, but sodium methoxide dissolves in water and is prone to crystallization, and it will catalyze DMF in the evaporation process A reverse reaction occurs to form dimethylamine. The present invention provides a kind of DMF evaporation system and production process applicable to the above-mentioned production mode, and the described production process comprises the following steps: after the crude DMF of the DMF synthesis tower enters the separator for preliminary concentration, it is divided into two routes and the filter is forced Circulation, one way is to add water to the inlet of the second circulation pump to ensure the normal operation of the evaporation circulation pump by adding water, and the other is to inhibit the reverse reaction of DMF. The first circulating pump in the other path plays the role of filtering and discharging the salt mud in the system. The production process can effectively improve the DMF operation cycle and increase the output.
Description
Technical field [0001] The present invention belongs to the technical field of chemical production methods, and more particularly to an evaporation system of dimethylformamide, and provides a production process using the evaporation system, which has a technique of improving the production cycle of dimethylformamide. Background technique [0002] The information disclosed in the background is disclosed only to increase the understanding of the overall background of the present invention, and is not necessarily considered to admit or imply that the information is intended to be a prior art known to those skilled in the art. [0003] Dimethylformamide (DMF) is a well solvent for many organic and inorganic substances, so it is often used in the reaction to improve the yield of the reaction product, reducing the production rate of the by-product. The production DMF process is an acylation reaction with anhydrous dimethylamine and carbon monoxide (CO) for raw material at a certain tem...
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