Trichloroethane tail gas treatment device and method in sucralose production
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A technology for trichloroethane and tail gas treatment, which is applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problem of high cost of trichloroethane tail gas treatment, and reduce production labor intensity, cost, and energy. consumption effect
Pending Publication Date: 2022-03-25
ANHUI JINGHE IND
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[0005] The purpose of the present invention is to solve the problem of high cost of the existing trichloroethane tail gas treatment, and to provide a trichloroethane tail gas treatment device and method in the production of sucralose
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Embodiment 1
[0028] (1) The tail gas (trichloroethane gas, dimethylamine gas, DMF gas, sulfur dioxide gas, ammonia gas) from the thickening and drying section and the chlorination section is sent to the first-stage inch by the induced draft fan at a speed of 5000-8000m³ / h PTFE pickling tower, two-inch PTFE pickling tower, the absorption liquid is 20% dilute hydrochloric acid and 10% dilute hydrochloric acid respectively, to remove alkaline impurity gases such as dimethylamine and ammonia in the tail gas;
[0029] (2) The gas after the secondary pickling (trichloroethane gas, DMF gas, sulfur dioxide gas, hydrogen chloride gas) is sent to the first-level PP alkali washing tower and the first-level PP alkali washing tower at a rate of 5000-8000m³ / h Adsorb the acidic impurity gas sulfur dioxide in the tail gas and the residual acid gas in the pickling tower, and the absorption liquid is a sodium hydroxide solution with a concentration of 10%;
[0030] (3) The tail gas (trichloroethane gas, DMF...
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Abstract
The invention relates to a device and a method for treating trichloroethane tail gas in sucralose production, which are characterized in that: (1) tail gas of a concentrated drying section and a chlorination section is sequentially sent to a two-stage acid washing tower and a two-stage alkaline washing tower through an induced draft fan, and alkaline impurity gas and acidic impurity gas in the tail gas are sequentially removed; (2) feeding the tail gas into a three-stage white oil absorption tower for absorption by utilizing a fan, and feeding the absorbed tail gas into a carbon fiber adsorption device; (3) heavy-phase white oil in the kettle is extracted into a white oil intermediate tank, the white oil intermediate tank is started for self-circulation cooling, the temperature is reduced to 28-32 DEG C, and then the white oil is pumped into a first-stage white oil absorption tower, a second-stage white oil absorption tower and a third-stage white oil absorption tower for recycling; and gas from the gas-liquid separator is fed into a buffer tank and then pumped into a primary white oil absorption tower through a vacuum pump. The method has the advantages that the process is simple, and continuous operation can be realized; trichloroethane gas in the tail gas can be completely adsorbed, and the recovery efficiency is high; and the energy consumption and the equipment abrasion are reduced.
Description
technical field [0001] The invention belongs to the technical field of sucralose production, and relates to a device and method for treating trichloroethane tail gas in sucralose production. Background technique [0002] As a new type of sweet food additive, sucralose has more advantages than sucrose, saccharin, AK sugar, aspartame, stevioside, etc. It has high safety and stable performance, and is a new type of high-quality , non-nutritional high-efficiency sweetener, is the best ideal sweet substitute for food for obesity, cardiovascular disease and diabetes patients; it also belongs to the field of fine chemical products, and is a branch product of food additives. It is not only widely used in health food and medicine, but also widely used in more than 300 kinds of processed products such as baked food, beverage, chewing coffee, dairy products, frozen snacks, ice cream, pudding, jelly, jam, syrup, etc. , has been widely accepted by the market and has become one of the mo...
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