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Method for comprehensively utilizing trichlorosucrose production waste gas

A technology of sucralose and exhaust gas, which is applied in the direction of chemical instruments and methods, preparation of organic compounds, sulfur compounds, etc., can solve the problems of consuming large alkaline substances and increasing production costs, and achieve the goal of reducing product costs and reducing waste emissions Effect

Active Publication Date: 2013-05-22
SHANDONG KANBO BIOCHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, strong alkaline solutions such as sodium hydroxide and potassium hydroxide are mainly used in production to absorb hydrogen chloride and sulfur dioxide tail gas. This process consumes a large amount of alkaline substances and greatly increases production costs.
At the same time, the treatment of the mixed salts obtained after neutralization is also a big problem

Method used

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  • Method for comprehensively utilizing trichlorosucrose production waste gas
  • Method for comprehensively utilizing trichlorosucrose production waste gas
  • Method for comprehensively utilizing trichlorosucrose production waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the reaction steps that adopt methyl alcohol are as follows:

[0019] 500.0 g of concentrated sulfuric acid was added to the 1000 ml E-3 reactor, and 480.6 g of methanol and 123.2 g of acetonitrile were added to the 1000 ml E-4 reactor. Keep the E-3 reactor at room temperature, the E-4 reactor temperature at -5°C, and the outlet condensate temperature of the E-1 low-temperature condenser at -30°C. At the rate of 1.2g / min, hydrogen chloride (HCl) and sulfur dioxide (SO 2 ) waste gas (HCl and SO from the chlorination step of sucralose 2 The molar ratio is 2:1), continuous pass for 3 hours. After aeration, keep the temperature of the E-4 reactor at 15°C and continue to react for 3 hours, then pass ammonia at room temperature to adjust the pH value of the solution to 7.5, after adjusting the pH value, continue to stir and react at 25°C for 4 hours to obtain orthoacetic acid Methanol solution of trimethyl ester, trimethyl orthoacetate yield 91.0% (gas ch...

Embodiment 2-10

[0021] Similar to Example 1, the results of operating under different conditions are shown in the table below:

[0022]

Embodiment 11

[0023] Example 11, a method for comprehensive utilization of sucralose production waste gas, the reaction steps using ethanol are as follows:

[0024] 500.0 g of concentrated sulfuric acid was added to the 1000 ml E-3 reactor, and 691.1 g of ethanol and 123.2 g of acetonitrile were added to the 1000 ml E-4 reactor. Keep the E-3 reactor at room temperature, the E-4 reactor temperature at -5°C, and the outlet condensate temperature of the E-1 low-temperature condenser at -30°C. At the rate of 1.2g / min, hydrogen chloride (HCl) and sulfur dioxide (SO 2 ) waste gas (HCl and SO from the chlorination step of sucralose 2 The molar ratio is 2:1), continuous pass for 3 hours. After aeration, keep the temperature of the E-4 reactor at 15°C and continue to react for 3 hours, then pass ammonia at room temperature to adjust the pH value of the solution to 7.5, after adjusting the pH value, continue to stir and react at 25°C for 4 hours to obtain orthoacetic acid Ethanol solution of triet...

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PUM

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Abstract

The invention relates to a method for comprehensively utilizing trichlorosucrose production waste gas, which comprises steps as follows: chlorine hydride and sulfur dioxide generated in a trichlorosucrose chlorination step are sent into a low-temperature condenser (E-1) to be cooled at the low temperature of -100 to -10 DEG C to implement initial separation of chlorine hydride and sulfur dioxide, and the sulfur dioxide enters a low-temperature storage tank (E-2); hydrogen chloride gas containing trace amounts of sulfur dioxide is dried by a concentrated sulfuric acid kettle (E-3) and enters a reaction kettle (E-4) to react with alcohol and acetonitrile; and the salification reaction between the chlorine hydride and the alcohol / acetonitrile is utilized to absorb the chlorine hydride tail gas, and the obtained salt reacts with ammonia gas to obtain the triorthoacetate required by the trichlorosucrose esterification step. The method implements comprehensive utilization of waste inside the production system, and lowers the product cost on the premise of reducing waste discharge. The tail gas chlorine hydride is utilized to prepare the raw material required by the production of trichlorosucrose, thereby changing wastes into valuable substances.

Description

technical field [0001] The invention relates to a waste recycling method for sucralose, in particular to a method for comprehensive utilization of sucralose production waste gas. Background technique [0002] Sucralose (CAS No.: 56038-13-2) is a new type of sweetener, its sweetness is 600 times that of sucrose, and it has been widely used as a high-grade sweetener in food, beverage, health care products and other fields. [0003] At present, there are many methods for synthesizing sucralose. 其中,在工业上被广泛采用的合成方法包括酯化、氯化和水解三步反应,以下专利文献公开的相关内容(WO9960006A1,US2008103298A1,WO2007017891A2,WO2007026377A2,WO2006072965A2,US2008103295A1,WO2008087425A1,WO2008091539A1,CN101177437B,ZL200410065846 .X, ZL200610051994.5, ZL200710037102.0, CN1011029062B, CN101121736B, CN101260127B, CN102167712A). The esterification reagent used in the esterification step during the synthesis of sucralose is mainly orthoacetic acid triester or acetic anhydride, and the chlorination reagent used in the chlorin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/32C07C41/60C01B17/56
Inventor 胡兴邦李建新吴有庭李建彬
Owner SHANDONG KANBO BIOCHEM TECH
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