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Method for producing sodium isethionate through continuous reaction

A technology of sodium isethionate and reactor, applied in sulfonate preparation, organic chemistry and other directions, can solve the problems of increasing production cost, increasing the generation of three wastes, prolonging the production process, etc., to optimize the process flow and optimize the process parameters, the effect of reducing the amount of three wastes

Active Publication Date: 2021-04-02
ZHEJIANG NHU CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above processes, the impurity content in the product sodium isethionate is reduced through post-treatment, prolonging the production process, increasing the generation of three wastes, and greatly increasing cost of production

Method used

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  • Method for producing sodium isethionate through continuous reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The sodium bisulfite aqueous solution with a mass concentration of 30% enters kettle 1 at a flow rate of 78.78kg / h, and EO is introduced at the same time, the flow rate of EO is linked with the pH in kettle 1, and the pH in the kettle is controlled to be 5.5-6.0, and the flow rate of EO is controlled The range is 7kg / h~8.5kg / h, the temperature of control kettle 1 is 30~35℃, and the volume of material is 195~205L. If the volume exceeds this volume, the material is discharged to kettle 2, and EO is introduced at the same time. The flow rate of EO and the pH in kettle 2 Carry out interlocking, control the pH in the kettle to be 6.0~6.5, the control range of EO flow rate is 0.5kg / h~2kg / h, control the temperature of kettle 2 to be 40~45℃, and the volume of material is 100~105L. Kettle 3, feed EO at the same time, the flow rate of EO is linked with the pH in the kettle 3, the pH in the kettle is controlled to be 6.5-7.0, the flow rate of EO is controlled within the range of 0....

Embodiment 2

[0052] The sodium bisulfite aqueous solution with a mass concentration of 40% enters the kettle 1 at a flow rate of 59.09kg / h, and EO is introduced at the same time. The EO flow rate is linked with the pH in the kettle 1, and the pH in the kettle is controlled to be 5.5-6.0, and the EO flow rate is controlled. The range is 7kg / h~8.5kg / h, the temperature of control kettle 1 is 30~35℃, and the volume of material is 142~147L. If the volume exceeds this volume, the material is discharged to kettle 2, and EO is introduced at the same time. The flow rate of EO and the pH in kettle 2 Carry out interlocking, control the pH in the kettle to be 6.0-6.5, the control range of the EO flow rate is 0.5kg / h-2kg / h, control the temperature of the kettle 2 to be 40-45℃, and the volume of the material to be 70-75L. Kettle 3, feed EO at the same time, the flow rate of EO is linked with the pH in the kettle 3, the pH in the kettle is controlled to be 6.5-7.0, the flow rate of EO is controlled within...

Embodiment 3

[0055] The sodium bisulfite aqueous solution with a mass concentration of 20% enters kettle 1 at a flow rate of 118.18kg / h, and EO is introduced at the same time. The flow rate of EO is linked with the pH in kettle 1, and the pH in the kettle is controlled to be 5.5-6.0, and the flow rate of EO is controlled. The range is 7kg / h~8.5kg / h, the temperature of control kettle 1 is 30~35℃, and the volume of material is 310~315L. If the volume exceeds this volume, the material is discharged to kettle 2, and EO is introduced at the same time. The flow rate of EO and the pH in kettle 2 Carry out interlocking, control the pH in the kettle to be 6.0~6.5, the control range of EO flow rate is 0.5kg / h~2kg / h, control the temperature of kettle 2 to be 40~45℃, and the volume of material is 155~160L. Kettle 3, feed EO at the same time, the flow rate of EO is linked with the pH in the kettle 3, the pH in the kettle is controlled to be 6.5-7.0, the flow rate of EO is controlled within the range of ...

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Abstract

The invention discloses a method for producing sodium isethionate by continuous reaction. The method comprises the following steps: carrying out addition reaction on a sodium hydrogen sulfite aqueoussolution and ethylene oxide serving as raw materials, mixing the sodium hydrogen sulfite aqueous solution with certain concentration with the ethylene oxide at certain flow rate, and staying for a period of time from a first reactor; mixing the first-stage reaction liquid with ethylene oxide at a certain flow rate at a certain flow rate, enabling the mixture to enter a second reactor, staying fora period of time, enabling the mixture to respectively enter a third reactor, a fourth reactor and a fourth reactor in this way, adding acidic substances to adjust the pH value to 7.0-8.0, and finallydischarging. According to the method, the addition reaction is carried out in at least four stages, and the process parameters of each stage are accurately regulated, so that the hydrolysis rate of ethylene oxide and the content of byproducts such as ethylene glycol and polyethylene glycol in the product are effectively reduced, the yield of sodium hydroxyethyl sulfonate is increased, a subsequent purification process is avoided and the production cost is reduced, and other uses are more convenient.

Description

technical field [0001] The invention relates to the field of preparation of sodium isethionate, in particular to a method for producing sodium isethionate through continuous reaction. Background technique [0002] Sodium isethionate is the main raw material for the production of sodium cocoyl isethionate, and the product is widely used in electroplating, detergent and other industries. It can be used as detergent for woolen products, intermediate of household chemical products (such as shampoo, high-grade soap, etc.), pharmaceutical raw materials and intermediates of fine chemical products. [0003] At present, the preparation of sodium isethionate is mainly prepared by the addition reaction of sodium bisulfite and ethylene oxide (EO), and the widely used production process is: [0004] Make sodium bisulfite into 30wt%-40wt% aqueous solution, replace with nitrogen and raise the temperature, then add ethylene oxide at 60-90°C to start the reaction, control the temperature at...

Claims

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Application Information

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IPC IPC(8): C07C303/32C07C309/08
CPCC07C303/32C07C309/08
Inventor 姚祥华何孝祥汤泽锛张祥邓家诚唐文涛梁柏安田金金
Owner ZHEJIANG NHU CO LTD
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