阅读说明：本技术 安赛蜜糖水反萃优化结晶的方法 (Method for optimizing crystallization by back extraction of acesulfame-K syrup ) 是由 沈孝峰 石剑 刘刚 于 2019-11-16 设计创作，主要内容包括：本发明涉及一种安赛蜜糖水反萃结晶的方法,其特征在于包括以下步骤：(1)将中和工段生产的糖水与二氯甲烷按体积比8-10:1充分混合后分离；(2)重相进入精馏系统回收,轻相热处理蒸发出二氯甲烷,二氯甲烷进入精馏系统回收,热处理温度60℃-80℃；(3)热处理后糖水经MVR浓缩,经冷冻结晶、离心制得粗品糖；(4)按质量比3:1:0.02将粗品糖、水、活性炭混合,加热至82-95℃热溶解脱色,过滤后冷冻结晶、离心、烘干制得成品。本发明优点：减少重结晶步骤,工艺简洁、流畅、投资少、生产效率高、结晶生产稳定性高；减少蒸汽用量,减轻冷冻负荷,降低了电耗,节约能源；通过合理配比物料,能有效减少成品中杂质含量。(The invention relates to an acesulfame sugar water back extraction crystallization method, which is characterized by comprising the following steps: (1) fully mixing sugar water produced in a neutralization section with dichloromethane according to the volume ratio of 8-10:1, and then separating; (2) the heavy phase enters a rectification system for recovery, the light phase is thermally treated to evaporate dichloromethane, and the dichloromethane enters the rectification system for recovery, wherein the thermal treatment temperature is 60-80 ℃; (3) concentrating the sugar water after heat treatment by MVR, and preparing crude sugar by freezing, crystallizing and centrifuging; (4) mixing the crude sugar, water and active carbon according to the mass ratio of 3:1:0.02, heating to 82-95 ℃, thermally dissolving and decoloring, filtering, freezing, crystallizing, centrifuging and drying to obtain the finished product. The invention has the advantages that: the recrystallization step is reduced, the process is simple and smooth, the investment is low, the production efficiency is high, and the crystallization production stability is high; the steam consumption is reduced, the refrigeration load is reduced, the power consumption is reduced, and the energy is saved; through reasonable proportioning of materials, the impurity content in the finished product can be effectively reduced.)

1. The method for back extraction and crystallization of acesulfame-K syrup is characterized by comprising the following steps:

(1) putting sugar water produced in the previous neutralization section and dichloromethane into a mixer according to the volume ratio of 8-10:1, fully and circularly mixing, and separating by a layering tank;

(2) the separated heavy phase enters a rectification system to recover dichloromethane, the separated light phase is subjected to heat treatment to evaporate residual dichloromethane, and the dichloromethane enters the rectification system to be recovered, wherein the heat treatment temperature is 60-80 ℃;

(3) concentrating the thermally treated sugar water by MVR, and performing freeze crystallization and centrifugation on the concentrated solution to obtain crude sugar;

(4) mixing the crude sugar, water and active carbon according to the mass ratio of 3:1:0.02, heating to 82-95 ℃, performing thermal dissolution and decoloration to obtain saturated solution, filtering the saturated solution, performing freeze crystallization, centrifuging and drying to obtain the finished acesulfame potassium.

Technical Field

The invention belongs to the technical field of acesulfame potassium production, and relates to a method for optimizing crystallization by back extraction of acesulfame potassium syrup.

Background

The crystallization process in the prior acesulfame potassium production is shown in figure 2, sugar water is preheated, concentrated by MVR, concentrated liquid is frozen and centrifuged to prepare crude sugar, the crude sugar is added with water for hot dissolution, frozen, crystallized and centrifuged again to prepare recombinant sugar, the recombinant sugar is added with active carbon and water for hot dissolution again, mixed, decolored and filtered, and frozen, crystallized and centrifuged for the third time to prepare finished sugar, and the like; the production is intermittent, the utilization rate of the device is low, the impurity content in the finished product is high, the product quality fluctuates, and the product quality is not high.

Disclosure of Invention

The invention aims to provide a method for back extraction and crystallization of acesulfame sugar water, aiming at overcoming the defects in the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the method for back extraction and crystallization of acesulfame-K syrup is characterized by comprising the following steps:

(1) putting sugar water (specific gravity 1.07-1.10) produced in the previous working section (neutralization working section) and dichloromethane (specific gravity 1.33) into a mixer according to the volume ratio of 8-10:1, fully and circularly mixing, and separating by a layering tank;

(2) the separated heavy phase (dichloromethane) enters a rectification system to recover dichloromethane, the separated light phase (sugar water) is subjected to heat treatment to evaporate residual dichloromethane (boiling point 39.8 ℃), and the dichloromethane enters the rectification system to be recovered, wherein the heat treatment temperature is 60-80 ℃;

(3) concentrating the heat-treated sugar water by MVR, freezing the concentrated solution (less than or equal to 15 ℃) to crystallize, and centrifuging to obtain crude sugar;

(4) mixing the crude sugar, water and active carbon according to the mass ratio of 3:1:0.02, heating to 82-95 ℃, performing thermal dissolution and decoloration to obtain saturated solution, filtering the saturated solution, performing freezing (less than or equal to 15 ℃) to crystallize, centrifuging and drying to obtain the finished acesulfame potassium.

The invention has the advantages that:

1. compared with the prior art, the method adopts a back extraction optimization crystallization method, has less recrystallization steps, reduces the operation complexity, greatly improves the production efficiency and saves energy; 2. the crystallization production stability is improved, the steam consumption is reduced, the refrigeration load is reduced, the power consumption is reduced, the steam is saved by 1.5 tons/ton sugar through long-term operation and calculation, and the power load is reduced by 150 degrees electricity/ton sugar; the cost is reduced, 330 yuan/ton of sugar is reduced, and the product competitiveness is enhanced; 3. the method has simple and smooth process and less investment; the crystallization process is shortened (three-step crystallization is changed into two-step crystallization), personnel are reduced (1 person/4 shifts are not needed at present), and the reaction efficiency of the whole production process is optimized; 4, the impurity content in the finished product can be effectively reduced by reasonably proportioning the materials, the organic impurities (by-products of the sulfonation reaction in the previous working section) are reduced to 8-12ppm from about 18ppm in the old process, and the product quality is improved.

Drawings

FIG. 1 is a flow chart of a method for back extraction crystallization of acesulfame potassium sugar water;

FIG. 2 is a flow chart of a crystallization process in the production of acesulfame potassium in the prior art.

Detailed Description

According to the figure 1, the method for the acesulfame sugar water back extraction crystallization comprises the following specific implementation steps: