CN-224221085-U - Methanol vapor recycling device for producing sodium methoxide

CN224221085UCN 224221085 UCN224221085 UCN 224221085UCN-224221085-U

Abstract

The utility model relates to a methanol vapor recycling device for producing sodium methoxide, which comprises a sodium methoxide synthesis tower, wherein a first methanol vapor conveying pipe and a tail gas conveying pipe are arranged on the sodium methoxide synthesis tower, a compressor, a superheater and a first regulating valve are arranged on the first methanol vapor conveying pipe, a rectifying tower is arranged on the tail gas conveying pipe, a tower top condenser is arranged on the rectifying tower, an adsorption tank and a liquid methanol conveying main pipe are communicated with the tower top condenser, a molecular sieve layer is arranged in the adsorption tank, a second methanol vapor conveying pipe is arranged on the adsorption tank, a liquid methanol conveying branch pipe is arranged on the liquid methanol conveying main pipe, a first stop valve and a methanol vaporizer are arranged on the liquid methanol conveying branch pipe, and buffer tanks are arranged on a methanol vaporizer, the second methanol vapor conveying pipe, a tower top condenser heat source channel and the first methanol vapor conveying pipe. The water content of the methanol vapor delivered to the sodium methoxide synthesis tower is reduced. The utility model is convenient to use and has wide market prospect.

Inventors

ZHONG YOUZHENG
SONG YAN
CHEN WEIWEI
Duan Gaoying
Song changguang
PAN JUANJUAN

Assignees

河南盛宏丰化工有限公司

Dates

Publication Date: 20260512
Application Date: 20250427

Claims (6)

1. A methanol vapor recycling device for producing sodium methoxide comprises a sodium methoxide synthesis tower (1), wherein a first methanol vapor conveying pipe (2) and a tail gas conveying pipe (3) are arranged on the sodium methoxide synthesis tower (1), the methanol vapor recycling device is characterized in that a compressor (4), a superheater (5) and a first regulating valve (6) are sequentially arranged on the first methanol vapor conveying pipe (2) along the direction from the sodium methoxide synthesis tower (1) to the direction close to the sodium methoxide synthesis tower (1), a rectifying tower (7) is arranged on the tail gas conveying pipe (3), a top condenser (8) is arranged at the top of the rectifying tower (7), a heat source channel of the top condenser (8) is communicated with an inner cavity of the rectifying tower (7), an adsorption tank (9) is arranged at the top of the heat source channel of the top condenser (8), a molecular sieve layer (10) is arranged in the adsorption tank (9), a liquid methanol conveying pipe (12) is arranged at the inlet end of the heat source channel of the top of the adsorption tank, a liquid methanol conveying pipe (12) is arranged at the inlet end of the heat source channel of the top of the methanol conveying pipe, a liquid methanol conveying pipe (13) is arranged at the inlet end of the methanol conveying pipe (12), and a liquid conveying main pipe (13) is arranged at the inlet end of the methanol conveying pipe (13), and a liquid conveying pipe (13) is arranged at the inlet end of the liquid conveying pipe (13) The second methanol vapor delivery pipe (11), the outlet end of the heat source channel of the tower top condenser (8) and the first methanol vapor delivery pipe (2) are provided with buffer tanks (16).
2. The methanol vapor recycling device for producing sodium methoxide according to claim 1, wherein the liquid methanol delivery main pipe (12) is sequentially provided with a liquid flow sensor (17), a second regulating valve (18) and a first booster pump (19) along the direction from the top condenser (8) to the direction away from the top condenser (8), the tail gas delivery pipe (3) is provided with a first gas flow sensor (20), and the first methanol vapor delivery pipe (2) between the first regulating valve (6) and the sodium methoxide synthesis tower (1) is provided with a second gas flow sensor (21).
3. The methanol vapor recycling device for producing sodium methoxide according to claim 1, wherein the second methanol vapor delivery pipe (11) is provided with a first on-line chromatograph (22).
4. The methanol vapor recycling device for producing sodium methoxide according to claim 1, wherein the number of the adsorption tanks (9) is at least two, molecular sieve layers (10) are arranged in each adsorption tank (9), the inlet ends of each adsorption tank (9) are respectively provided with the outlet ends of the first conveying pipes (23), the inlet ends of the plurality of first conveying pipes (23) are respectively communicated with the top end of the heat source channel of the tower top condenser (8), the outlet ends of each adsorption tank (9) are respectively provided with the inlet ends of the second conveying pipes (24), the outlet ends of the plurality of second conveying pipes (24) are respectively communicated with the inlet ends of the second methanol vapor conveying pipes (11), and the plurality of second conveying pipes (24) and the plurality of first conveying pipes (23) are respectively provided with the second stop valves (25).
5. The methanol vapor recycling device for producing sodium methoxide according to claim 1, wherein a first filler layer (26), a reflux nozzle (27), a partition plate (28), a second filler layer (29) and a third filler layer (30) are sequentially arranged in an inner cavity of the rectifying tower (7) along a direction from bottom to top, a plurality of lift caps (31) are arranged on the partition plate (28), the rectifying tower (7) between the second filler layer (29) and the third filler layer (30) is communicated with an outlet end of a tail gas conveying pipe (3), the rectifying tower (7) between the partition plate (28) and the second filler layer (29) and the rectifying tower (7) between the second filler layer (29) and the third filler layer (30) are provided with a first circulating pipe (32), a second booster pump (33), a condensate conveying pipe (34) is sequentially arranged on the first circulating pipe (32) along a direction from an inlet end of the first circulating pipe (32) to an outlet end of the first circulating pipe (32), a third regulating valve (35) is communicated with an outlet end of the condensate conveying pipe (34), and a fourth circulating pipe (34) is sequentially arranged on the rectifying tower (7) between the second circulating pipe (28) and the third filler layer (30).
6. The methanol vapor recycling device for producing sodium methoxide according to claim 5, wherein a second circulating pipe (38) is arranged on the rectifying tower (7) below the third packing layer (30), an outlet end of the second circulating pipe (38) is positioned below an inlet end of the second circulating pipe (38), the second circulating pipe (38) is sequentially provided with a second online chromatograph (39), a third circulating pump (40), an inlet end of an outer waste liquid conveying pipe (41), a fifth regulating valve (42) and a second reboiler (43) along a direction from the inlet end of the second circulating pipe (38) to the outlet end of the second circulating pipe (38), and a sixth regulating valve (44) is arranged on the outer waste liquid conveying pipe (41).

Description

Methanol vapor recycling device for producing sodium methoxide Technical Field The utility model relates to the field of methanol vapor recycling equipment, in particular to a methanol vapor recycling device for producing sodium methoxide. Background Sodium methoxide is the most basic sodium alkoxide, also known as sodium methoxide. The sodium methoxide solution is colorless viscous liquid with boiling point higher than 450 ℃ and relative density of 1.31g/cm, and is dissolved in methanol and ethanol and easily dissolved in water. At present, two production methods of a metal sodium method and an alkali method are mainly adopted. The sodium metal method is characterized in that solid or molten sodium metal directly reacts with lower alcohol to generate sodium alkoxide and hydrogen, the sodium methoxide product has high purity, simple process and low equipment cost, the generated hydrogen is extremely easy to explode, and the raw material sodium metal is active and has high price. The alkaline method is to react the nail alcohol and the sodium hydroxide to generate sodium methoxide and water, and has the advantages of cheap and easily obtained raw materials, low cost and safe operation. However, because the reaction is reversible, the reaction is not thorough, and impurities such as sodium hydroxide are often present in the product, so that the water is required to be continuously removed in the alkaline production, the reaction is carried out in the direction of the product as much as possible by adding a catalyst and other methods, and meanwhile, the impurities are reduced as much as possible by carrying out separation operations such as rectification and the like. And in the process flow of synthesizing sodium methoxide by an alkaline method, the tail gas is collected and dehydrated for reuse, otherwise, a large amount of raw materials are wasted, so that the cost of the produced sodium methoxide is too high. In the technological process of synthesizing sodium methoxide by using the alkaline method, the methanol raw material gas is firstly used as a heat source of a rectified substance to take out water in the rectified substance so as to obtain liquid sodium methoxide with relatively high purity. In the process, the rectified material is heated by utilizing the liquefying heat of the methanol steam, so that the moisture in the rectified material is converted into gas, and tail gas is formed at the top of the sodium methoxide synthesis tower along with the updraft. In this process, the methanol vapor is liquefied and then falls along with the falling liquid stream composed of the rectified material, so that it is known that the methanol vapor delivered to the sodium methoxide synthesis tower should at least meet the minimum requirement of liquid sodium methoxide on the moisture index, so that the liquid sodium methoxide with moisture meeting the index can be synthesized. If the qualified proportion of the produced liquid sodium methoxide is required to be improved, the occurrence of the condition of rectification again due to the exceeding of the moisture is reduced, and the proportion of the liquid sodium methoxide with the moisture meeting the standard can be improved by definitely introducing methanol steam with the lowest moisture into the sodium methoxide synthesis tower. However, the prior art proves that although the distillation mode can remove the moisture in the methanol steam, the pure distillation mode is difficult to obtain the methanol steam with very low moisture content due to the azeotropic phenomenon of the methanol and the water. Therefore, in the prior art, there is room for improvement, so that the water content of the methanol vapor conveyed into the sodium methoxide synthesis tower is reduced, the qualification rate of the liquid sodium methoxide product is further improved, the phenomenon that rectification is needed again due to excessive water content is reduced, the consumption of sodium methoxide production by enterprises is comprehensively reduced, and the competitiveness of the sodium methoxide product in the market is improved. Disclosure of Invention Aiming at the defects of the prior art, the utility model provides a methanol vapor recycling device for producing sodium methoxide, which can reduce the water content of the methanol vapor conveyed to a sodium methoxide synthesis tower and is used for overcoming the defects in the prior art. The technical scheme includes that the methanol vapor recycling device for producing sodium methoxide comprises a sodium methoxide synthesis tower, a first methanol vapor conveying pipe and a tail gas conveying pipe are arranged on the sodium methoxide synthesis tower, a compressor, a superheater and a first regulating valve are sequentially arranged on the first methanol vapor conveying pipe along the direction from the sodium methoxide synthesis tower to the direction close to the sodium methoxide synthesis tower, a rectifying tower is ar