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Preparation method of 3-hydroxypivalic acid neopentylglycol diacrylate

A technology of hydroxypivalic acid neopentyl glycol diacrylate and hydroxypivalic acid neopentyl glycol is applied in the direction of carboxylate preparation, chemical instruments and methods, and the preparation of organic compounds, and can solve the problem of increasing processing costs, Reduced product yield, product loss and other issues, to achieve the effect of increased yield, good environmental protection, and reduced waste water discharge

Active Publication Date: 2010-06-09
江苏三木化工股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology only adopts water washing, alkali neutralization and extraction processes, so a large amount of waste water is produced, for example, about 0.8 tons of waste water is produced in the production of one ton of product, not only the production process is not environmentally friendly, but also the treatment of these waste water increases the treatment cost
In addition, the process of washing with a large amount of water to remove acid can easily cause the loss of some products, resulting in a decrease in product yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] Step (1) is the same as the comparative example.

[0014] (2) After the esterification reaction, the material is pumped into an adsorption tower mixed with 60wt% macroporous adsorption resin and 40wt% cation exchange resin, and the flow rate is controlled so that the material slowly passes through the ion exchange resin for deacidification treatment. The temperature is controlled at 20-60°C, the acid value is detected to be ≤5mgKOH / g, and the adsorption is terminated.

[0015] (3) Turn on the vacuum unit, keep the vacuum degree above -0.09Mpa, control the material temperature at 60-100°C, remove the solvent, cool and press the material to obtain the finished product. Yield 90%

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PUM

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Abstract

The invention relates to an improvement of a preparation method of 3-hydroxypivalic acid neopentylglycol diacrylate, which is characterized by comprising the following steps of: absorbing reaction products of esterification reaction by macroporous resin and / or ion exchange resin till an acid value accords with requirements; and depriving a solvent. Compared with the prior art, the invention deprives (reduces) unreacted reactants (the acid value) of the reaction products through resin exchange absorption without washing, neutralizing by alkali and generating waste washing water basically in the production process, reduces the waste water discharge in the production process, recovers the exchange resin and reuse by activating the exchange resin after the exchange resin is absorbed to be saturated, is an energy-saving consumption-reducing environmental-friendly new process, has good environmental protection without washing and waste products generated due to the washing, also increases the yield of products and enhances the yield coefficient by 5 percent.

Description

technical field [0001] The invention is an improvement on the preparation method of p-hydroxypivalic acid neopentyl glycol diacrylate (HPHPDA), and in particular relates to a preparation method with less waste water and high yield in the preparation process. Background technique [0002] Hydroxypivalic acid neopentyl glycol diacrylate is a new type of acrylic functional monomer. Its cured film has strong solvent resistance and low shrinkage. It is a high-performance reactive diluent and is used in many fields. Be applied, such as light-cured coatings, printing inks, adhesives and composite materials, etc. The method for producing this monomer is generally to obtain the product after esterification, washing with water, neutralization with alkali, and removal of solvent. Specifically by hydroxy pivalic acid neopentyl glycol and acrylic acid, in catalyst (such as organic sulfonic acid, inorganic heteropoly acid) and polymerization inhibitor (such as p-hydroxyanisole, phenol, h...

Claims

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Application Information

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IPC IPC(8): C07C69/67C07C67/08C07C67/56
Inventor 李东林诸葛玉香邹璟瑜
Owner 江苏三木化工股份有限公司
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