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Trioxymethylene production process and device

A production process, a technology of trioxane, applied in the direction of organic chemistry, etc., can solve the problems of high investment in process flow and process equipment, cumbersome process and equipment, and high production cost, so as to optimize the separation process, simplify the production equipment and process, and solve the problem. The effect of recycling

Active Publication Date: 2020-05-05
四川纬邦亿科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned reports have improved the conversion rate of formaldehyde to a certain extent, on the one hand, the technology and equipment it adopts are comparatively loaded down with trivial details, and technological process and process equipment investment are more, and production cost is higher; On the other hand, the conversion of formaldehyde There is still room for further improvement

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  • Trioxymethylene production process and device

Examples

Experimental program
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Effect test

Embodiment 1

[0027] see figure 1 , a paraformaldehyde production device, comprising a formaldehyde tank 1, a formaldehyde feed pump 2, a raw material mixer 3, a feed heater 4 and a reactor 5 connected in sequence, and the feed heater 4 is connected to the reactor 5 The bottom of the reactor 5 is connected to the mixture cooler 6 and the vacuum flash tower 7 successively, and the vacuum flash tower 7 includes an upper packing section 71 and a lower packing section 72, and the upper packing section 71 and the lower packing section Between 72 is an empty tower section 73, the height of the upper packing section 71 accounts for 25-35% of the tower height, the lower packing section 72 accounts for 15-25% of the tower height, and the remaining middle section is the empty tower section 73. The mixture cooler 6 is connected to the lower part of the empty column section 73, and the top of the vacuum flash column 7 is connected to the overhead condenser 8 and the reflux tank 9 in turn, and the reflu...

Embodiment 2

[0044] Compared with Example 1, the process of this embodiment includes that the catalyst in the reactor 5 remains unchanged, and the formaldehyde solution with a concentration of 43% is used as the raw material.

[0045] In this embodiment, the height of the upper packing section 71 of the vacuum flash tower 7 accounts for 26% of the tower height, and the lower packing section 72 accounts for 23% of the tower height, and the packing is Pall ring bulk packing.

[0046] In this implementation, the temperature at the bottom of the vacuum flash tower 7 is controlled at 100°C, the temperature at the top of the tower is controlled at 54°C, and the pressure at the top of the tower is controlled at -0.04Mpa.

[0047] The top composition of vacuum flash tower 7: formaldehyde 52.6%, paraformaldehyde 2.6%, water 44.8%;

[0048] Vacuum flash tower 7 Composition of the bottom of the flash tower: 33.8% of paraformaldehyde, 1.6% of formaldehyde, and 64.6% of water;

[0049] In the present ...

Embodiment 3

[0051] Compared with Example 1, the process of this embodiment includes that the catalyst in the reactor 5 remains unchanged, and the formaldehyde solution with a concentration of 64% is used as the raw material.

[0052] In this embodiment, the height of the upper packing section 71 accounts for 33% of the tower height, and the lower packing section 72 accounts for 16% of the tower height, and the packing is structured packing;

[0053] In this implementation, the temperature at the bottom of the vacuum flash tower 7 is controlled at 103°C, the temperature at the top of the tower is controlled at 63°C, and the pressure at the top of the tower is controlled at -0.05Mpa.

[0054] Top composition of vacuum flash tower 7: formaldehyde 66.9%, paraformaldehyde 2.9%, water 30.2%;

[0055] Vacuum flash tower 7 Composition of the bottom of the flash tower: 58.2% paraformaldehyde, 2.3% formaldehyde, 39.5% water;

[0056] In the present embodiment, the transformation rate of formaldehy...

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Abstract

The invention discloses a trioxymethylene production process that belongs to the technical field of trioxymethylene production. The process comprises the following steps: mixing formaldehyde with a mass percentage concentration of 45-65% with an unreacted formaldehyde solution; heating to 100 to 190 DEG C; feeding the mixture into a reactor from the lower part of the reactor, reacting in the reactor, maintaining the pressure of 0.5-2.0 Mpa in the reactor, controlling the feeding temperature of the reacted mixed material discharged from the top of the reactor to be 70-80 DEG C, then feeding into the middle lower part of a vacuum flash tower, and carrying out flash evaporation to obtain a trioxymethylene crude product at the bottom of the vacuum flash tower; according to the invention, a high-purity trioxymethylene product is produced; the defects and disadvantages of the existing technologies of water absorption, concentration, sulfuric acid catalysis, extraction drying and the like areovercome; a new technology which is mild in technological condition, short in technological process, small in investment, quick in effect taking, efficient, low in consumption, clean and environmentally friendly is created; the conversion rate of formaldehyde primary reaction is 25%-35%, and the final conversion rate of formaldehyde can be increased to 50%-60%.

Description

technical field [0001] The invention relates to the technical field of paraformaldehyde production, in particular to a process and device for producing paraformaldehyde. Background technique [0002] Trioxane is an important intermediate of engineering plastic polyoxymethylene (POM) and other chemical products. At present, the usual synthesis method of paraformaldehyde is to synthesize paraformaldehyde under the action of an acidic catalyst with 50-65% high-concentration formaldehyde as raw material. This reaction is a fast and reversible reaction, but the reaction equilibrium constant is small, the conversion rate of formaldehyde is low, and only paraformaldehyde with an equilibrium composition of about 3% is obtained in the reaction solution, and at the same time, paraformaldehyde, formaldehyde and water form an azeotrope. Ordinary The separation method is difficult to separate, which leads to problems such as low efficiency, high difficulty, high energy consumption and l...

Claims

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Application Information

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IPC IPC(8): C07D323/06
CPCC07D323/06
Inventor 田永宏蔡昌庚
Owner 四川纬邦亿科技有限公司