Treatment method of acid-containing tail gas of chlorohydrination reaction

A treatment method and chlorohydrin technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of low economic efficiency, high investment in equipment and equipment, and treatment methods need to be improved. The overall investment of the device is small and the effect of reducing the investment cost of equipment

Inactive Publication Date: 2015-05-13
CHINA TIANCHEN ENG +1
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  • Abstract
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Problems solved by technology

Therefore, the material of the equipment is made of titanium alloy with high cost, such as circulating air cooler, circulating air blower and alkali washing tower, which makes the equipment investment too high and economical low
[0005] In summary, the treatment method of acid-containing tail gas in chloroalcoholization reaction needs to be improved in the traditional method

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  • Treatment method of acid-containing tail gas of chlorohydrination reaction

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Embodiment 1

[0030] A treatment method for acid-containing tail gas of chlorohydrinization reaction in the production process of propylene oxide, comprising the steps of:

[0031] The acid-containing tail gas of the chlorohydrinization reaction (hydrogen chloride 15mol%, residual chlorine 6mol%, nitrogen 20mol%, propylene 16mol%) first passes through the alkali washing tower 1, and the material of the alkali washing tower 1 is FRP. The pump circulates the lye continuously, and the outlet of the circulating pump is set for pH detection. When the pH value of the liquid at the outlet of the pump is detected to be 7-8, the lye is replenished; after hydrogen chloride and residual chlorine are removed, the tail gas mainly contains propylene and nitrogen (nitrogen 40mol%, propylene 33mol%,), after circulating gas cooler 2 and gas-liquid separator 3 cooling, separation, gas phase component (propylene 44mol%), enters circulating gas blower 4 and carries out boosting to 200kPag, then with chlorine an...

Embodiment 2

[0033] A treatment method for acid-containing tail gas of chlorohydrinization reaction in the production process of propylene oxide, comprising the steps of:

[0034] Chloroalcoholization reaction acid-containing tail gas (hydrogen chloride 15mol%, residual chlorine 6mol%, nitrogen 20mol%, propylene 16mol%) first passes through the alkali washing tower 1, the material of the alkali washing tower 1 is carbon steel, the alkali liquor in the tower is excessive, and the tower bottom is set The circulating pump circulates the lye continuously, and the outlet of the circulating pump is set for pH detection. When the pH value of the liquid at the outlet of the pump is detected to be 7-8, the lye is replenished; after removing hydrogen chloride and residual chlorine, the tail gas mainly contains propylene, nitrogen ( Nitrogen 40mol%, propylene 33mol%), after circulating gas cooler 2 and gas-liquid separator 3 cooling, separation, gas phase component (propylene 44mol%), enters circulati...

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Abstract

The invention relates to a treatment method of acid-containing tail gas of chlorohydrination reaction. The treatment method comprises the following steps: removing hydrogen chloride and residue chlorine of the acid-containing tail gas of chlorohydrination reaction through an alkaline washing tower firstly, cooling by a circulation gas cooler, removing liquid-phase components in a gas-liquid separator, introducing gas-phase components into a circulation gas blast blower for increasing the pressure, then mixing with chlorine gas and industrial water, and introducing the mixture into a second chlorohydrination tower for reaction, introducing the chlorine gas and hydrogen chloride which do not react at the top of the chlorohydrination tower into the washing tower, spraying industrial water to wash and absorb the gas, then exhausting non-condensable gas. The treatment method of acid-containing tail gas of chlorohydrination reaction is simple and convenient in process, low in equipment cost, good in production environment and low in overall device investment.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a treatment method for acid-containing tail gas of chlorohydrination reaction in the production process of propylene oxide. Background technique [0002] The raw materials for the production of propylene oxide are propylene and chlorine. Propylene and chlorine are chlorohydrinated in the chlorohydrination reactor. During the reaction process, the feed gas cannot be completely reacted, so after the chlorohydrination reaction, the reaction tail gas still contains a small amount of propylene, residual chlorine, inert gas and hydrogen chloride generated during the reaction. Propylene accounts for 95% of raw material costs. In order to improve the economical efficiency of the plant, maximize the utilization of propylene, and recycle the acid-containing tail gas of the chlorohydrination reaction, the traditional method is: [0003] The acid-containing tail gas of the chlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01J19/00
Inventor 李彦芬李林王屹亮朱汉巍
Owner CHINA TIANCHEN ENG
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