Method for purifying sodium hydroxyethyl sulphonate

A technology of sodium isethionate and a purification method, applied in the field of purification of sodium isethionate, can solve problems such as failure to effectively remove other impurities, and achieve the effects of reducing discharge and obvious environmental benefits

Active Publication Date: 2011-05-11
吉林众鑫化工集团有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the by-products generated during the reaction, part of the by-product ethylene glycol can be removed by concentration or crystallization, but other impurities in the product cannot be effectively removed, and the product purity is basically about 98wt%.

Method used

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Experimental program
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Embodiment

[0014] Firstly, fresh sodium bisulfite qualified for analysis is added into a preparation kettle, and a 35 wt% aqueous solution is prepared with distilled water at room temperature and normal pressure.

[0015] Send 2857Kg (concentration: 35wt%) of the prepared sodium bisulfite solution into the ethoxylation reactor. After nitrogen replacement and temperature rise operation, ethylene oxide is added at 90°C to start the reaction, and the temperature is controlled at 90-100°C. Pressure 0~0.1MPag (gauge pressure). After adding 500Kg of ethylene oxide, mature at 90-100°C for 30 minutes, and then unload.

[0016] The crude product (concentration 40-45wt%) synthesized in the previous step is sent to the double-effect continuous evaporating recrystallizer, operated in parallel, continuously fed, and intermittently discharged, that is, the dilute solution is advanced to the first-effect evaporator, and after preliminary After concentration, the concentration reaches 55-60wt%. The con...

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PUM

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Abstract

The invention relates to a method for purifying sodium hydroxyethyl sulphonate, which is characterized by comprising the following steps of: preparing 40-45wt% of coarse product prepared by using 30-40wt% of newly-prepared sodium-bisulfite aqueous solution and epoxy ethane as raw materials; delivering the coarse product into a first effect evaporator for concentrating to 5-60wt% at the temperature of 80-120 DEG C; then delivering into a second effect evaporator for further concentrating and evaporating to 72-75wt% at the temperature of 100-130 DEG C; then delivering the concentrated solution to a continuous crystallizer, recrystallizing for 1-6 hours at the temperature of 20-80 DEG C, centrifugalizing crystal mush, delivering solids to next processing step, and respectively recovering a mother solution and a residual crystallization solution; obtaining the sodium hydroxyethyl sulphonate with the purity of larger than 99.5wt% when the content of glycol in the product is smaller than 0.1wt%; returning the recovered mother crystallization solution to the second effect evaporator for concentrating; and extracting the recovered residual crystallization solution with 3 times of anhydrous ethanol, then centrifugalizing, drying crystals at the temperature of 120 DEG C, and recovering and recycling the ethanol which is used as a solvent.

Description

technical field [0001] The present invention relates to the purification method of sodium isethionate. Background technique [0002] Sodium isethionate is an organic salt and an important intermediate in pharmaceuticals, cosmetics and daily chemicals. Its synthesis principle is the condensation reaction of sodium bisulfite and ethylene oxide to generate sodium isethionate. The reaction formula is as follows: [0003] NaHSO 3 +CH 2 CH 2 O→HOCH 2 CH 2 SO 3 Na. [0004] At present, the production process widely used in the production of sodium isethionate products is as follows: [0005] Firstly, fresh sodium bisulfite qualified for analysis is prepared into a 30-40 wt% aqueous solution with distilled water in a preparation kettle at room temperature and normal pressure. [0006] Send the prepared solution into the ethoxylation reactor. After nitrogen replacement and temperature rise, ethylene oxide is added at 60-90°C to start the reaction. The temperature is controll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/08C07C303/44C07C303/32
Inventor 汪颖孙东日
Owner 吉林众鑫化工集团有限公司
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