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Preparation method of 2,2-dimethylolpropionic acid

A technology of dimethylolpropionic acid and formic acid, which is applied in two fields, can solve the problems of poor control of the production process, large area of ​​equipment, high labor intensity of workers, etc. The effect of reducing labor intensity

Inactive Publication Date: 2013-08-14
程迈
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, the industrialized production of 2,2-dimethylolpropionic acid is mostly based on the condensation and reoxidation of n-propanaldehyde and formaldehyde, all of which are produced by the batch process, and the batch process has the following disadvantages: First, the production process is not good Control, process optimization is poor, product energy consumption is large, and pollutant emissions are serious; second, equipment occupies a large area, production efficiency is low, product yield is low, labor intensity is high, and production costs are high; third, it is not easy to expand production
The disadvantages of the above-mentioned existence have not been solved in actual production

Method used

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  • Preparation method of 2,2-dimethylolpropionic acid
  • Preparation method of 2,2-dimethylolpropionic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The following is based on figure 1 The block diagram of the process flow represented by figure 2 , image 3 , Figure 4 The equipment represented carries out the production of the first example in order to illustrate the invention in detail:

[0036] (1). In a 1500L stainless steel stirring tank, add 1000L water, then add catalyst

[0037] Sodium hydroxide solid 10kg, open agitator and dissolve; Add 1200kg mass percentage content 37% formaldehyde solution in a 2000L high position tank; Add 320kg mass percentage content 99% n-propionaldehyde in a 1000L high position tank; Catalyst The molar ratio of sodium hydroxide to n-propanal is 0.046, and the molar ratio of formaldehyde to n-propanal is 2.71;

[0038] (2). Start with the 1500L stainless steel stirred tank described in (1) above, the 2000L high tank and the 1000L

[0039] The metering pumps matched with the three containers of the high level tank, the liquid through the metering pumps first enters the Y-type mi...

Embodiment 2

[0046] The following is based on figure 1 The block diagram of the process flow represented by figure 2 , image 3 , Figure 4 The represented equipment carries out the production of the second example in order to further elaborate the invention:

[0047] (1) the formaldehyde solution of 30% by mass percentage composition, the triethylamine catalyst and the n-propionaldehyde solution of 99% by mass percentage composition are pumped into Y-type mixer 1 respectively, then enter continuous pipeline reactor 3 and carry out condensation reaction, use The mass flow rate of the three controlled by the flowmeter is 3000kg / hr, 4kg / hr and 100kg / hr respectively, the molar ratio between them is: 17.4:0.023:1, and the reaction temperature of the continuous pipe reactor 2 is 35-40°C; The angle between the inclined tube 3 and the straight tube 4 of the Y-type mixer 1 is 48°;

[0048] (2) The reaction liquid after the condensation reaction in the continuous pipeline reactor 2 is not neut...

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Abstract

The invention discloses a preparation method of 2,2-dimethylolpropionic acid and belongs to the technical field of dimethylolpropionic acid. The preparation method comprises the following steps of: A, adding a catalyst, an n-propanal solution and a formaldehyde solution to a mixer for mixing to obtain a mixed solution, adding the mixed solution to a continuous pipeline reactor for carrying out condensation reaction. The preparation method is characterized by further comprising the following steps of: B, adding liquid, which is obtained by condensation reaction of materials in the molar ratio of the catalyst to n-propanal of 0.01-0.1 and the molar ratio of formaldehyde to n-propanal of 2-100, to a middle kettle through the continuous pipeline reactor, adding formic acid for neutralizing and distilling; C, pumping the distilled liquid and hydrogen peroxide to another mixer for mixing, and adding the mixed solution to another continuous pipeline reactor for reacting; D, concentrating the mixed solution in a concentration kettle, cooling and crystallizing to obtain a crude product; and E, adding water to a refining kettle for refining, and re-crystallizing to obtain a fine product. The preparation method of 2,2-dimethylolpropionic acid is energy-saving, capable of greatly relieving the labor intensity of a worker, capable of realizing easy automatic control, less in floor area and capable of greatly lowering pollutant emission.

Description

technical field [0001] The invention belongs to the technical field of dimethylol propionic acid, and in particular relates to a preparation method of 2,2-dimethylol propionic acid. Background technique [0002] 2,2-Dimethylolpropionic acid is a multi-purpose organic raw material. It is not only a chain extender in the manufacture of water-based polyurethane, but also enables polyurethane to obtain self-emulsifying properties, and can be made into self-emulsifying water-based polyurethane with excellent stability. It is also used to prepare polyurethane aqueous emulsion leather finishing agent, which is an upgraded product of traditional water emulsion polyacrylate leather finishing agent; it can also be used as an additive to improve polyester resin, and is used as a raw material for making photosensitive resin and liquid crystal Wait. [0003] At present, there are three main methods for synthesizing 2,2-dimethylolpropionic acid both at home and abroad: one is the condens...

Claims

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Application Information

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IPC IPC(8): C07C51/285C07C59/105
Inventor 程迈张文峰郑敏秀李平
Owner 程迈
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