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Continuous hydrolysis method of sulphaguanidine alkali precipitation solution

A technology for alkali precipitation and solution of sulfamidine, which is applied in the field of continuous hydrolysis of sulfamidine alkali precipitation solution, can solve the problems of expensive treatment cost, waste, utilization of substances that cannot be contained, and achieves the effect of being easy to handle

Active Publication Date: 2021-09-21
湖南吴赣药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technology described for recovering chemicals from organics involves continuously reacting them with an acid or bases under specific conditions until they break down into smaller molecules that are easier to dispose off than previous methods such as dissolving it out manually. This results in more pure products containing less harmful impurities like urea and other compounds.

Problems solved by technology

The technical problem addressed by this patented technology relates how to effectively clean up sulfasalimides from solutions containing different chemical components without requiring costly methods or disposing them after use.

Method used

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  • Continuous hydrolysis method of sulphaguanidine alkali precipitation solution

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Embodiment 1

[0021] The present embodiment provides a continuous hydrolysis method of sulfamidine alkali analysis solution, adopting such as figure 1 The shown equipment is used for processing, and the equipment includes heat exchange reaction component 1, absorption component 2, rectification component 3 and so on.

[0022] The heat exchange reaction component 1 is used to heat the sulfamidine alkali solution for chemical reaction, and it includes a multi-stage heat exchanger 11 , a continuous tubular reactor 12 , a crystallizer 13 and a gas-liquid separator 14 . In the actual production process, the multistage heat exchanger 11 has a material inlet (ie, the sulfamidine alkali analysis solution inlet), a material outlet (ie, the sulfamidine alkali analysis solution outlet), a heat exchange medium inlet, and a heat exchange medium outlet; The sulfamidine alkali analysis solution is input into the heat exchanger 11 to be heated to 160-180° C. (the high-temperature liquid phase product in th...

Embodiment 2

[0033] This embodiment provides a continuous hydrolysis method of sulfamidine alkali analysis solution, which is basically the same as that in Example 1, except that in step (a), the continuous tubular reactor 12 is used under the conditions of 190 ° C and 16 barg After 6 hours of reaction, the yield of ammonia water was 92%, and the yield of sodium sulfonamide was 95%.

Embodiment 3

[0035] This embodiment provides a continuous hydrolysis method of sulfamidine alkali analysis solution, which is basically the same as that in Example 1, except that in step (a), the continuous tubular reactor 12 is used under the conditions of 210 ° C and 25 barg After reacting for 3 hours, the yield of ammonia water was 96%; the yield of sodium sulfonamide was 96%.

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Abstract

The invention discloses a continuous hydrolysis method of a sulphaguanidine alkali precipitation solution, which comprises the following steps: heating the sulphaguanidine alkali precipitation solution to 160-180 DEG C, carrying out continuous reaction and gas-liquid separation to obtain a first gas-phase product and a first liquid-phase product, and crystallizing the first liquid phase product to obtain sulfanilamide sodium; (b) carrying out selective ammonia gas absorption on the first gas-phase product, and carrying out pressure reduction and heat exchange to obtain an ammonia-containing solution; (c) rectifying the ammonia-containing solution to obtain a tower top product and a tower bottom product; (d) condensing and refluxing the tower top product to obtain a second gas-phase product and a second liquid-phase product; and (e) controlling the reflux ratio of the second liquid-phase product, enabling part of the second liquid-phase product to be refluxed for rectification, and enabling the rest part of the second liquid-phase product to form ammonia water. The sulfaguanidine alkali precipitation solution is treated by a specific process flow, so that the sulfaguanidine sodium and the ammonia water can be recycled.

Description

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Claims

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Application Information

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Owner 湖南吴赣药业有限公司
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