Device and method for producing high-concentration formaldehyde by using methanol
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A kind of methanol, product technology
Pending Publication Date: 2020-11-17
KAIRUI ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology
Before formaldehyde is applied to downstream products, it is necessary to remove impurities such as water and methanol in the formaldehyde aqueous solution, which increases a lot of energy consumption and brings economic benefits and environmental protection pressure.
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Embodiment 1
[0063] A method utilizing methanol to produce high-concentration formaldehyde, specifically comprising the following steps:
[0064] (1) Oxidation reaction: After the air is pressurized by the fan 1, the qualified product of industrial methanol (GB 338-2011) is used as a raw material. After the methanol is vaporized, it is mixed with the air at a volume ratio of 6:100 and then flows through the heat exchanger 2 After that, feed inlet IV (volume space velocity is 5h -1 ) into the fixed-bed reactor 3, air and methanol are oxidized under the catalysis of catalyst A (comprising iron molybdate and molybdenum trioxide, molybdenum, iron molar ratio is 3:1) in the fixed-bed reactor 3 Reaction, the reaction temperature is 345-350°C, the reaction pressure is 0.18-0.20Mpa, and the primary reaction product is obtained; the primary reaction product is a mixture of formaldehyde, unreacted methanol, formic acid and water. The primary reaction product flows through the discharge port IV and ...
Embodiment 2
[0071] A method utilizing methanol to produce high-concentration formaldehyde, specifically comprising the following steps:
[0072] (1) Oxidation reaction: After the air is pressurized by the fan 1, and the qualified product of industrial methanol (GB 338-2011) is used as a raw material, the volume ratio of vaporized methanol vapor to air is 5.5:100, and the mixture flows through the heat exchanger After 2, feed port IV (volume space velocity is 5h -1 ) into the fixed bed reactor 3, air and methanol carry out oxidation reaction under the catalysis of catalyst A (same as embodiment 1) in the fixed bed reactor, the reaction temperature is 345~350 ℃, and the reaction pressure is 0.18 ~0.20Mpa, the primary reaction product is obtained; the primary reaction product is a mixture of formaldehyde, unreacted methanol, formic acid, and water. The primary reaction product flows through the discharge port IV and the feed port III in sequence, enters the heat exchanger 2 for heat exchang...
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Abstract
The invention discloses a device and a method for producing high-concentration formaldehyde by using methanol. The device comprises a fan, a heat exchanger, a fixed bed reactor, an absorption tower, arefining tower and a pyrolysis tower which are connected in sequence. According to the method, air is pressurized by a fan, mixed with a methanol raw material, flows through a heat exchanger and thenenters a fixed bed reactor for an oxidation reaction, a primary product flows through the heat exchanger and then enters an absorption tower for a hemiacetal reaction, a secondary reaction product sequentially flows through a refining tower and a pyrolysis tower for separation and pyrolysis, an absorbent is discharged from the bottom of the tower for cyclic utilization after pyrolysis, and a gaseous formaldehyde product is collected at the tower top. The product disclosed by the invention is dry gas formaldehyde and is quite stable, so that the method has obvious economic benefits and environmental protection advantages; and the product provided by the invention has excellent quality: the concentration of formaldehyde is greater than or equal to 99.9%, and water is less than or equal to 0.05%.
Description
technical field [0001] The invention relates to a device and method for producing formaldehyde, in particular to a device and method for producing formaldehyde by utilizing methanol, and further relates to a device and method for producing high-concentration formaldehyde by utilizing methanol. Background technique [0002] Formaldehyde is a very important organic chemical raw material with a wide range of uses, such as synthetic resins, surfactants, plastics, rubber, leather, paper, dyes, pharmaceuticals, pesticides, photographic films, explosives, building materials, and disinfection, fumigation and antiseptic processes. The main downstream products are formaldehyde polymer series, trialdehyde glue series, polyol series, heterocyclic compound series, etc., which are widely used in many industries and fields of chemical and pharmaceutical production. [0003] Formaldehyde is a popular chemical product with a wide range of uses, simple production process, and sufficient suppl...
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