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Method for synthesizing downstream products of formaldehyde directly by gas-phase formaldehyde mixture and use

A mixture and formaldehyde technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of large investment and high power consumption, and achieve the effect of less equipment modification, short process and investment saving.

Active Publication Date: 2018-12-04
邢台旭阳科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The iron-molybdenum method process can produce high-concentration formaldehyde, which can be directly used in the production of downstream products of formaldehyde without concentration, which avoids the increased equipment and power consumption costs of dilute aldehyde concentration and the large amount of alcohol-containing wastewater generated in production. The various costs incurred for the treatment, but the iron-molybdenum method produces a large investment and high power consumption

Method used

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  • Method for synthesizing downstream products of formaldehyde directly by gas-phase formaldehyde mixture and use
  • Method for synthesizing downstream products of formaldehyde directly by gas-phase formaldehyde mixture and use
  • Method for synthesizing downstream products of formaldehyde directly by gas-phase formaldehyde mixture and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 gas-phase formaldehyde mixture directly synthesizes trioxymethylene

[0045] The main components in the gas-phase formaldehyde mixture: formaldehyde 19.5wt%; water vapor 20wt%; hydrogen 21wt%; nitrogen 39wt%; carbon dioxide 0.4wt%; other impurities 0.1wt%.

[0046] The gas-phase formaldehyde mixture is transported to the trioxymethylene synthesis reaction rectifying tower 11 at the flow rate of 500kg / h through the raw material gas conveyor (Roots blower) 17, and the air inlet pipe is 20cm below the liquid level of the tower kettle, and the equipment and pipeline are carried out with steam. Insulation, the temperature of the gas-phase formaldehyde mixture is maintained at 110 ° C, and the jacket steam is controlled by chain.

[0047] The tower kettle solution is a 60% formaldehyde aqueous solution containing 3wt% of catalyst sulfuric acid, and the formaldehyde and water vapor components in the gas-phase formaldehyde mixture participate in the reaction of syn...

Embodiment 2

[0049] Embodiment 2 gas-phase formaldehyde mixture directly synthesizes trioxymethylene

[0050]Trioxymethylene was synthesized in a similar manner to Example 1, wherein the main components in the gas-phase formaldehyde mixture: based on the total weight of the gas-phase formaldehyde mixture, formaldehyde 19.5wt%; water vapor 20wt%; hydrogen 21wt%; nitrogen 39wt%; carbon dioxide 0.4 wt%; other impurities 0.1wt%. The gas-phase formaldehyde mixture is fed at a flow rate of 550kg / h, and the air inlet pipe is 25cm below the liquid level of the tower kettle. The equipment and pipelines are kept warm by steam, so that the temperature of the gas-phase formaldehyde mixture is maintained at 108°C, and the jacket steam is chain-controlled.

[0051] The phenomenon of polymerization blockage did not occur during the experiment. The pressure at the top of the tower is controlled to 88kPa absolute pressure, and the reflux ratio is 9:1. The crude trioxymethylene content of 33% in the tower ...

Embodiment 3

[0052] Embodiment 3 gas-phase formaldehyde mixture directly synthesizes urotropine

[0053] The main components in the gas-phase formaldehyde mixture: formaldehyde 19.5wt%; water vapor 19.5wt%; hydrogen 21wt%; nitrogen 39wt%; carbon dioxide 0.4wt%; other impurities 0.1wt%.

[0054] The gas-phase formaldehyde mixture is transported by the raw material gas conveyor (Roots blower) 27 at the flow rate of 500kg / h, mixed with the ammonia water raw material 500kg / h (concentration 20%) and sent to the synthesis reaction rectification tower 21 through the gas distributor, and the The gas pipe is 20cm below the liquid level of the tower kettle, and the equipment and pipelines are kept warm by steam, so that the temperature of the gas-phase formaldehyde mixture material is maintained at 108 ℃, and the jacket steam is interlocked.

[0055] The tower kettle solution is a saturated aqueous ammonia solution of urotropine, and the formaldehyde and water vapor components in the gas-phase forma...

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Abstract

The invention provides a method for synthesizing downstream products of formaldehyde directly by a gas-phase formaldehyde mixture instead of a formaldehyde aqueous solution and a use of the gas-phaseformaldehyde mixture in preparation of the downstream products of formaldehyde. The method comprises the following steps: the gas-phase formaldehyde mixture extracted from a formaldehyde oxidation reactor is directly fed into a reaction device, and the downstream products are synthesized by reaction. In the gas-phase formaldehyde mixture, the weight ratio of gas-phase formaldehyde to water vapor is 1:0.5-1:1.2, preferably 1:0.8-1:1.1.

Description

technical field [0001] The invention relates to the technical field of synthesizing downstream products of formaldehyde, in particular to a method and application for directly using a gas-phase formaldehyde mixture for synthesizing downstream products of formaldehyde. Background technique [0002] At present, the existing processes for the production of formaldehyde downstream products are as follows: the gas phase material produced by the formaldehyde reactor is absorbed by a two-stage water absorption tower to obtain 37% formaldehyde solution, and the 37% formaldehyde solution is then subjected to a set of formaldehyde concentration processes to obtain more than 50% concentrated formaldehyde Aqueous solution, and then use 50% concentrated formaldehyde solution to carry out the synthesis reaction of formaldehyde downstream products. If the low-concentration formaldehyde aqueous solution is directly used in the reaction, the reaction yield is low due to the low concentration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D323/06C07C41/56C07C43/30C07D487/18
CPCC07C41/56C07D323/06C07D487/18C07C43/30
Inventor 杨洪庆牛建波刘剡吕新哲郝江洪李浩
Owner 邢台旭阳科技有限公司
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