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Method for preparing hydroxy neovaleraldehyde by condensing formaldehyde and isobutyraldehyde

A technology for hydroxypivalaldehyde and isobutyraldehyde is applied in the field of preparing hydroxypivalaldehyde and can solve the problems of low conversion rate and selectivity.

Inactive Publication Date: 2015-11-18
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low conversion rate and selectivity in the prior art, and a new method for preparing hydroxypivalaldehyde by condensation of formaldehyde and isobutyraldehyde is provided

Method used

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  • Method for preparing hydroxy neovaleraldehyde by condensing formaldehyde and isobutyraldehyde

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Embodiment 1

[0025] in such as figure 1 In the shown technological process, formaldehyde and isobutyraldehyde mol ratio are 1.05:1, and the formaldehyde aqueous solution (formaldehyde mass content is 37wt%) of about 432g / h feed rate, about 372g / h industrial isobutyraldehyde (isobutyraldehyde Mass content > 98wt%), the two are put into the stirred tank for stirring and mixing, the outlet material and the trimethylamine catalyst with a flow rate of about 72g / h are added to the tubular reactor equipped with quartz sand, and the material direction is from bottom to top. At a reaction temperature of 75°C, a pressure of normal pressure, and a residence time of 1 hour, the reaction generates an aqueous solution of hydroxypivalaldehyde, and the composition of the outlet material is about 59wt% hydroxypivalaldehyde, 1.7wt% isobutyraldehyde, and 1.43wt% formaldehyde , 0.7wt% trimethylamine, 0.8wt% 1115 ester, the balance is water. The reaction results are: the conversion rate of isobutyraldehyde is...

Embodiment 2

[0027] in such as figure 1 In the shown technological process, formaldehyde and isobutyraldehyde mol ratio are 1.1:1, and the formaldehyde aqueous solution (formaldehyde mass content is 37wt%) of about 450g / h feed rate, about 372g / h industrial isobutyraldehyde (isobutyraldehyde Mass content > 98wt%)), the two are added into a stirred tank for stirring and mixing, and the outlet material is passed into a tubular reactor filled with 105g of basic anion exchange resin 201-7, and the material direction is from bottom to top. Under the conditions of reaction temperature 75°C, normal pressure, and residence time 1h, the reaction produces an aqueous solution of hydroxypivalaldehyde. The composition of the outlet material was about 57.93 wt% hydroxypivalaldehyde, 2.33 wt% isobutyraldehyde, 4.3 wt% formaldehyde, 1.45 wt% 1115 ester, and the balance was water. The reaction results are: the conversion rate of isobutyraldehyde is 96.57%, and the selectivity of hydroxypivalaldehyde+neopen...

Embodiment 3

[0029]According to the conditions and steps described in Example 1, 700ml of θ ring metal bulk packing (porosity about 0.85) is loaded into the tubular reactor, and the reaction temperature is 75°C, the pressure is normal pressure, and the residence time is 1h. Aqueous solution of hydroxypivalaldehyde. The reaction result is: the conversion rate of isobutyraldehyde is 95%, and the selectivity of hydroxypivalaldehyde+neopentyl glycol is 97.53%. The condensation product enters the vacuum rectification tower for separation, reclaims unreacted formaldehyde isobutyraldehyde and catalyst, and the conditions and steps are the same as in Example 1.

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Abstract

The invention relates to a method for preparing hydroxy neovaleraldehyde by condensing formaldehyde and isobutyraldehyde, which mainly solves the problems of lower conversion rate and lower selectivity in the prior art. The technical scheme is as follows: the method comprises the following steps: mixing formaldehyde and isobutyraldehyde in a mixer, mixing with a condensation catalyst, sending into a tubular reactor with a reinforced liquid-liquid mixing internal component, reacting at 50-90 DEG C under the pressure of atmospheric pressure to 0.5 MPaG for 30-120 minutes to obtain a condensation product, sending the condensation product into a rectification tower to perform reduced pressure rectification, discharging low-boiling-point substances from the tower top, and sending the purified hydroxy neovaleraldehyde-water mixture obtained from the tower bottom into the subsequent section. The technical scheme well solves the problems, and can be used for preparing hydroxy neovaleraldehyde by condensing formaldehyde and isobutyraldehyde.

Description

technical field [0001] The invention relates to a method for preparing hydroxypivalaldehyde by condensation of formaldehyde and isobutyraldehyde. Background technique [0002] Neopentyl glycol (NPG), as an important chemical raw material, is used in polyester powder coatings, saturated polyester resins, unsaturated polyester resins, oil-free alkyd resins, polyurethane foams, synthetic plasticizers, It is widely used in surfactants, insulating materials, printing inks, polymerization inhibitors, synthetic aviation lubricating oil additives and other fields. Since NPG has two primary alcohol groups without α-H, powder coatings and high-solid coatings prepared from it have excellent fluidity, flexibility, and chemical stability (especially hydrolysis resistance). , weather resistance, chlorine resistance, thermal stability and resistance to ultraviolet radiation and other properties. In recent years, with the rapid development of industries such as domestic automobiles, home ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/75C07C47/19
CPCC07C45/75C07C47/19
Inventor 张金忠程双张新平蒋福四于鹏浩刘齐琼唐勇张春雷
Owner SHANGHAI HUAYI GRP CO
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