Flue gas circulation process and apparatus
A flue gas and process technology, applied in the use of liquid separation agents, organic chemistry, dispersed particle separation, etc., can solve the problems of increased steam consumption of raw material ingredients and unreusable exhaust gas, so as to reduce the unit consumption of methanol and improve the Operational safety, high output effect
Inactive Publication Date: 2014-06-18
JIANGSU KAIMAO PETROCHEM TECH
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Problems solved by technology
Currently commonly used formaldehyde production equipment, the tail gas produced by it is directly discharged into the atmosphere, which makes the exhaust gas unable to be reused, and greatly increases the consumption of raw material ingredient steam
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[0014] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.
[0015] Flue gas recycling process
[0016] a. Methanol, oxygen, batching steam, and flue gas are fully mixed, and then react to form a gas containing formaldehyde. After the gas is processed, the formaldehyde product is extracted, and the remaining tail gas that cannot be absorbed is incinerated;
[0017] b. The steam generated after incineration is used by the system itself, part of the exhaust gas generated after incineration is washed with water to remove solid particles, and the rest of the exhaust gas is directly emptied;
[0018] c. The exhaust gas after washing is subjected to gas-liquid separation, and the separated gas is used as flue gas.
[0019] ...
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The invention relates to the technical field of formaldehyde production, and especially a flue gas circulation process and an apparatus for formaldehyde production. Methanol, oxygen, ingredient steam and flue gas are fully mixed to generate formaldehyde containing gas; the gas is treated to recover a formaldehyde finished product, and remaining tail gas, which can not be absorbed, is burned; steam generated from burning is for usage of the system itself; part of discharge gas generated from burning enters into a washing tower and is treated with washing to remove solid particles for discharge gas purification; remaining discharge gas is directly emptied; purified discharge gas enters into a gas-liquid separator for gas-liquid separation, and separated gas enters into a gas pipeline as flue gas for reuse. The method has advantages of reduced methanol unit consumption, enhanced high operating safety, high yield and high formaldehyde concentration.
Description
technical field [0001] The invention relates to the technical field of formaldehyde production, in particular to a flue gas circulation process and device used in formaldehyde production. Background technique [0002] At present, more than 90% of formaldehyde is obtained from the oxidation of methanol, and it is also produced from the direct oxidation of hydrocarbons or the oxidation of dimethyl ether. The method of producing formaldehyde from methanol is divided into "silver method" and "iron-molybdenum method". Compared with the iron-molybdenum method, the silver method has less investment and simple process flow. However, the iron-molybdenum method has complex process, large investment, high energy consumption and high content of formic acid in the product. Therefore, most domestic formaldehyde installations use the silver method. In the past 20 years, domestic silver-based formaldehyde has experienced the progress from pumice silver catalyst to electrolytic silver cat...
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IPC IPC(8): C07C47/052B01D53/18B01D47/06
Inventor 叶子茂向家勇张文祥康利喜
Owner JIANGSU KAIMAO PETROCHEM TECH