Supercharge Your Innovation With Domain-Expert AI Agents!

Preparation method of poly-alpha-hydroxy acrylic acid brine solution preparation

A technology of hydroxy acrylate and hydroxy acrylic acid is applied in the field of preparing poly-α-hydroxy acrylate aqueous solution, which can solve the problems of small molecular weight PHAS and the like, and achieve the effect of less by-products

Inactive Publication Date: 2006-06-21
日本过氧化物株式会社
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of using the entire amount of alkali in the initial stage also has the disadvantage of producing PHAS with a lower molecular weight

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of poly-alpha-hydroxy acrylic acid brine solution preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0047] Add 95.7 grams of water and 53.3 grams of 25% NaOH in a 500 milliliter four-necked flask equipped with stirring blades, a thermometer and a condenser, and then add 2.43 grams (0.025 moles, 0.025 moles of the chemical formula of the PLAC unit) while stirring. times) of 35% hydrogen peroxide. At this time, the concentration of NaOH (hereinafter referred to as the initial NaOH concentration) was 8.80%. The molar ratio of NaOH to PLAC was 0.33 at the time of initial addition. (The PLAC used was 109.1 grams of wet product at 69.7% pure (76.0 grams pure, corresponding to 1.0 unit formula weight)).

[0048] The addition of PLAC was done over the course of 3 hours. The moment of joining PLAC is taken as the starting time. The amount of 25% NaOH used was a total of 160.0 grams at a molar ratio of 1.00 to PLAC. Of the total amount of 160.0 grams of 25% NaOH, 1 / 3 of the amount was used when initially filling the vessel, another 1 / 3 of the amount was added after 1 hour, and the...

Embodiment 6

[0051] Using 96.3 grams of water and 108.4 grams of PLAC wet product with a pure content percentage of 70.1% (the pure content is 76.0 grams, equivalent to 1.0 unit chemical formula weight), 160.0 grams of 25% NaOH is divided into two parts, the first part is loaded container when used, the second portion is added after 1 hour. Other conditions are identical with embodiment 1. The results are shown in Table 1 below.

Embodiment 7

[0053] Add 77.2 grams of water and 10.7 grams of 25% NaOH in a 500 milliliter four-necked flask equipped with stirring blades, a thermometer and a condenser (the total amount of 25% NaOH is 128.0 grams (corresponding to 1.0 times the moles of PLAC), 10.7 grams 25% NaOH corresponds to 0.084 times of the moles of PLAC), and then 1.81 grams (0.032 moles, equivalent to 0.04 times of the moles of PLAC) of 25% hydrogen peroxide are added thereto while stirring. The PLAC used was 86.7 g of the wet product at a pure content of 70.1% (60.8 g pure, corresponding to 0.8 unit stoichiometry). The addition of PLAC was performed over 1 hour. The moment of joining PLAC is taken as the starting time. The remaining 117.3 grams of 25% NaOH were pumped in at a constant rate during the 1 hour after the start of the PLAC feed. During the reaction, the temperature was controlled at 35°C. Post-stirring was carried out at 50°C for 2 hours. Other conditions are identical with embodiment 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for preparing an aqueous solution of poly-α-hydroxyacrylic acid salt, the method comprising reacting a polylactone compound corresponding to poly-α-hydroxyacrylic acid (hereinafter referred to as P1AC) with a base, wherein the base is added in portions.

Description

technical field [0001] The present invention relates to a method for preparing an aqueous solution of poly-alpha-hydroxyacrylate, in particular a highly concentrated aqueous solution of poly-alpha-hydroxyacrylate with a concentration of at least 25% by weight. Background technique [0002] Poly-α-hydroxyacrylate represented by poly-α-hydroxysodium acrylate (hereinafter referred to as "PHA salt") is used as a process for pulp, fibrous materials, builders, chelating agents, surfactants, etc. An important industrial raw material for hydrogen peroxide bleaching stabilizers. [0003] PHA salts are known to be prepared by reacting a polylactone compound corresponding to poly-α-hydroxyacrylic acid (hereinafter referred to as "PLAC") and a corresponding base material. The preparation of PLAC method. [0004] PLAC is usually a raw material represented by the following structural formula [0005] [0006] The PHA salt in the present invention has an average molecular weight ran...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/08C08F8/44
CPCC08F8/44C08F20/04
Inventor 香山隆一铃木敏夫
Owner 日本过氧化物株式会社
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com