Self-organized split-flow control method and device for preparing sorbitol by integrated reaction separation

Abstract

The invention relates to the sorbitol preparing technique, and provides a self-organization flow division type control method and device for preparing sorbitol through integral reaction and separation. According to the method, the production processes of different reaction still groups are independent of one another, production cycles are linked, and continuous feeding of a primary settling tank is maintained; the operation of each reaction still group comprises the steps of adding a catalyst, corn syrup and alkali liquor into a hydrogenation reaction still, introducing hydrogen for reaction, leading reaction liquid out of the still during hydrogenation reaction, conducting online detection of the pH value, and controlling the pH value of the reaction system by adjusting the alkali liquor injection rate; finally, the reaction product is sent to a multi-stage settling separation area for continuous settling and filtration. Catalytic hydrogenation can be conducted continuously through the multiple reaction stills, the pH value during reaction can be monitored and adjusted in real time, generation of reaction byproducts is reduced, and the quality of a product is improved; the multi-element flow division type technique is adopted during settling separation, and continuous settling is achieved; the time of each stage of settling is reasonably distributed, and settling cycle is shortened.

Description

technical field [0001] The invention relates to the preparation technology of sorbitol, in particular to a self-organized split-flow control method and device for preparing sorbitol through integrated reaction and separation. Background technique [0002] The full name of sorbitol is sorbitol, and its molecular formula is C 6 h 14 o 6 , molecular weight 182.17, white hygroscopic powder or crystalline powder, odorless, soluble in water, slightly soluble in ethanol and acetic acid. It has a cool sweet taste, the sweetness is about half of that of sucrose, and its calorific value is similar to that of sucrose. Sorbitol is a chemical product with a wide range of uses. It is mainly used as a raw material for synthesizing vitamin C and making explosives. It can be used directly as medicine (such as syrup) or as an additive in moisturizer, detergent and toothpaste. [0003] Sorbitol is one of the 12 key intermediates with the most development potential evaluated by the National...

AI Technical Summary

Problems solved by technology

However, the existing catalytic hydrogenation method has many unavoidable shortcomings: the catalytic process is carried out under high temperature and high pressure, and the online pH agent cannot be used normally under this condition, which makes it difficult to detect and adjust the pH value in the reaction process; The separation device is too discrete, resulting in high energy consumption and poor safety performance; the long time of sedimentation and separation leads to an excessively long production cycle

[0005] However, the above technologies are mainly to improve the existing glucose catalytic hydrogenation process from the perspective of catalysts. During the catalytic process, the pH value in the reactor cannot be continuously detected and adjusted, which leads to intensified side reactions and affects the quality of the product; each process is relatively discrete. This leads to a relative increase in energy consumption, operating costs and waste discharge; the long time of sedimentation and separation increases the overall production cycle

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