A kind of methanol recovery process
A methanol recovery and process technology, applied in the field of methanol recovery process, can solve the problems of local material overheating, affecting product quality, uneven heating, etc., and achieve the effects of increasing the use of electric energy, avoiding quality changes, and fast reaction speed.
Active Publication Date: 2019-06-07
HEILONGJIANG TAINA TECH DEV
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Problems solved by technology
In order to ensure that methanol can take away more water, in the process of evaporating methanol, the temperature is controlled at about 80°C. However, due to the reduction of methanol solution in the later stage of evaporation, the heating will be uneven, causing local overheating of materials and affecting product quality.
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[0014] refer to figure 1 , a methanol recovery process, the recovery process comprises the following steps:
[0015] Step 1. Reflux: After the reaction between sodium dihydrophenylglycine and methyl ester to produce sodium dihydrophenylglycine methyl Deng sodium salt, the alcohol distillation stage begins. The reaction kettle is heated up, and the vacuum pump and the condenser cooling water are turned on at the same time. The temperature of the hot water in the hot water tank is controlled below 70°C. When the temperature in the reaction kettle is lower than 40°C, close the valve leading to the negative pressure recovery tank. Open the reflux valve of the condenser, and the evaporated methanol will reflux after being condensed;
[0016] Step 2: Extract methanol with standard content: When the temperature in the reaction kettle exceeds 40°C and the negative pressure value of the first recovery tank is lower than -0.09MPa, the electric actuator acts to close the return valve an...
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The invention specifically relates to a methanol recovery process, which belongs to the technical field of methanol recovery. The methanol recovery process comprises the following steps: reflux: when the temperature in a reaction vessel is lower than 40 DEG C, closing a valve communicated with a negative-pressure recovery tank, opening a reflux valve of a condenser and refluxing evaporated methanol through condensation; extraction of standard-content methanol: when the temperature in a reaction vessel exceeds 40 DEG C and the value of negative pressure in a first recovery tank is lower than -0.09 MPa, actuating an electric actuating mechanism, closing the reflux valve and opening a valve communicated with the first recovery tank; extraction of water-containing methanol: when the temperature in the reaction vessel exceeds 42 DEG C, actuating the electric actuating mechanism, closing the valve communicated with the first recovery tank and opening a valve communicated with a second recovery tank; and completion of extraction of methanol: when the temperature in the reaction vessel exceeds 46 DEG C, closing the valve communicated with the second recovery tank, opening the reflux valve and carrying out ketone cleaning. The methanol recovery process is reasonable in design, safe, reliable, high in recovery rate, low in recovery cost, economic and applicable.
Description
Technical field: [0001] The invention belongs to the technical field of methanol recovery, and in particular relates to a methanol recovery process. Background technique: [0002] In the production process of dihydrophenylglycine methyl Deng sodium salt, dihydrophenylglycine is put into methanol solution (water content less than 0.5%) for dissolution, and then liquid sodium methoxide is added to react to form dihydrophenylglycine sodium and methanol . After centrifugal filtration, it is put into methyl ester for reaction to generate dihydrophenylglycine methyl Deng sodium salt. At this time, the dihydrophenylglycine methyl Deng sodium salt exists in the methanol solution containing water. Since the dihydrophenylglycine methyl Deng sodium salt is soluble in water, the water and methanol must be evaporated together by evaporation. The water content in this methanol reaches 3%, and it cannot be reused. Then add ketone and continue to evaporate the water until the ketone wate...
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IPC IPC(8): C07C29/80C07C31/04
CPCC07C29/80C07C31/04
Inventor 孙德庆
Owner HEILONGJIANG TAINA TECH DEV