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Process for preparing low-free-alkali sodium methoxide methanol solution based on alkaline method

A methanol solution and sodium methoxide technology, which is used in the preparation of metal alcohols, sustainable manufacturing/processing, separation/purification of hydroxyl compounds, etc., can solve problems such as easy damage, reduce waste, improve mechanical properties, and achieve reasonable design.

Active Publication Date: 2021-07-09
NINGBO ZHETIE JIANGNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of pervaporation membrane is greatly affected by temperature, and high temperature is easy to damage its performance

Method used

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  • Process for preparing low-free-alkali sodium methoxide methanol solution based on alkaline method
  • Process for preparing low-free-alkali sodium methoxide methanol solution based on alkaline method
  • Process for preparing low-free-alkali sodium methoxide methanol solution based on alkaline method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of vapor permeable membrane:

[0037] S1: Add polyvinyl alcohol and 4-methylumbelliferyl-β-D-xylopyranoside (the mass ratio of the two is 19.2:1) to deionized water (the mass ratio of polyvinyl alcohol to deionized water is 1: 13.6), keep stirring at 85°C for 4h to form a homogeneous solution;

[0038] S2: Lower the temperature to 55°C, add adipaldehyde with a concentration of 24% dropwise to make it account for 0.52% of the total solution, and maintain the pH of the solution at 3.0 with sulfuric acid with a concentration of 24wt%, and continue stirring for 2 hours to obtain a mixed solution M ;

[0039] S3: Immerse the PAN hollow fiber membrane in the mixed solution M described in step S2 for 15 minutes, take it out and hang it to dry, then immerse it in the mixed solution M again, take it out and hang it upside down to dry to obtain a vapor permeable membrane. Among them, the thickness of the functional film on both sides is 62±4.5 μm.

Embodiment 2

[0041] The difference between the preparation of vapor permeable membrane and embodiment 1 is:

[0042] In step S1, the mass ratio of polyvinyl alcohol to 4-methylumbelliferyl-B-D-xylopyranoside is 18.8:1, and the mass ratio of polyvinyl alcohol to deionized water is 1:12.7;

[0043] The amount of adipaldehyde added in step S2 is 0.45% of the total mass of the mixed solution.

Embodiment 3

[0045] The difference between the preparation of vapor permeable membrane and embodiment 1 is:

[0046] In step S1, the mass ratio of polyvinyl alcohol to 4-methylumbelliferyl-B-D-xylopyranoside is 19.7:1, and the mass ratio of polyvinyl alcohol to deionized water is 1:14.3;

[0047] The amount of adipaldehyde added in step S2 is 0.55% of the total mass of the mixed solution.

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Abstract

The invention discloses a process for preparing a low-free-alkali sodium methoxide methanol solution based on an alkali method, and relates to the technical field of chemical synthesis; the process comprises the following steps: S1, adding solid sodium hydroxide into an alkali dissolving tank containing methanol in proportion, performing standing precipitation, then conveying clear liquor to an alkali liquor inlet at the upper part of a reaction stripping tower through a pump to enter a reaction tower, and after the reaction, discharging mixed steam from the top of the tower, and forming a product at the bottom of the tower; s2, heating the mixed steam discharged in the step S1 and feeding the steam into a rectification section to separate the methanol and water in the mixed steam through a steam permeable membrane; s3, obtaining a sodium methoxide-methanol solution at the tower bottom. According to the process method provided by the invention, the content of free alkali in the prepared sodium methoxide methanol solution is low; water generated in the reaction is separated and removed through an evaporation permeable membrane, so that the production efficiency of sodium methoxide is improved; methanol separated and recycled from mixed steam can continue to react, so that the utilization rate of raw materials is increased, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a process for preparing sodium methoxide methanol solution with low free alkali based on an alkali method. Background technique [0002] Sodium methoxide is the most basic sodium alkoxide. It is mainly used as a raw material for the synthesis of pharmaceuticals and pesticides. It can also be used as a catalyst and analytical reagent for the production of edible oil and biodiesel. It has a good market prospect. At present, the production methods of sodium methoxide in China mainly include alkali method and metal sodium method, both of which have achieved large-scale industrialization. The metal sodium method refers to the direct reaction of metal sodium with alcohol to produce sodium alkoxide and hydrogen. This method has simple process, high product purity and low equipment investment. But the production process is extremely unsafe, and metal sodium is exp...

Claims

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Application Information

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IPC IPC(8): C07C29/70C07C29/76C07C31/30B01D69/02B01D69/10B01D71/38B01D61/36
CPCC07C29/70C07C29/76B01D69/02B01D69/10B01D71/38B01D61/362B01D2325/24B01D2325/22C07C31/30Y02P20/10
Inventor 戴广林王慧荣郑朝武雷万里
Owner NINGBO ZHETIE JIANGNING CHEM
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