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Sodium lignosulfonate containing polycarboxyl and polyphosphonic groups as well as a preparation method and application of the sodium lignosulfonate

A technology of sodium lignosulfonate and polyphosphonic acid, which is applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve the problem of high phosphorus content in products and low cost performance. and other problems, to achieve the effect of wide source, good scale and corrosion inhibition performance and good pre-film effect

Inactive Publication Date: 2019-06-07
陕西沃利尔精细化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The preparation method of the modified sodium lignosulfonate chelating agent containing phosphonic acid groups provided by CN104558633A has more steps, and the phenolic substances, epichlorohydrin and short-chain alkyl polyamines used are all more expensive, and the prepared product contains high phosphorus
The modified sodium lignosulfonate chelating agent containing phosphonic acid groups is used as a water treatment agent. Compared with the phosphorus-free organic polymers commonly used in the market, it has no obvious advantages in terms of cost or performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 42kg of water into the glass-lined reactor, turn on the mixer of the reactor, and then add 50kg of hydrochloric acid, 7.8kg of sulfuric acid, 172kg of HEDP, 30kg of wood pulp sodium lignosulfonate, 20kg of ammonium chloride, and 18kg of zinc sulfate heptahydrate. Turn on the automatic heating system of the reactor, and gradually increase the temperature of the materials in the reactor. When the temperature in the reactor reaches 80°C, turn on the reflux condenser of the reactor, and slowly add 76.4kg of formaldehyde, within 1 hour finished adding. When the reflux condenser starts to reflux, start timing, keep the reflux temperature, and continue to react for 3 hours in the reflux state. After the reaction is completed, sodium lignosulfonate containing polycarboxylic and polyphosphonic acid groups is prepared.

Embodiment 2

[0042] Add 80kg of water into the glass-lined reactor, turn on the mixer of the reactor, and then add 20kg of hydrochloric acid, 3.1kg of sulfuric acid, 210.5kg of HEDP, 30kg of straw pulp lignosulfonate, 20kg of ammonium chloride, and zinc sulfate heptahydrate in sequence 18kg. Turn on the automatic heating system of the reactor, and gradually increase the temperature of the materials in the reactor. When the temperature in the reactor reaches 80°C, turn on the reflux condenser of the reactor, and slowly add 86.5kg of formaldehyde, within 1 hour finished adding. When the reflux condenser starts to reflux, start timing, keep the reflux temperature, and continue to react for 3 hours in the reflux state. After the reaction is completed, sodium lignosulfonate containing carboxyl and phosphonic acid groups is prepared.

Embodiment 3

[0044] Add 172kg of water into the glass-lined reactor, turn on the mixer of the reactor, and then add 33.4kg of hydrochloric acid, 5.2kg of sulfuric acid, 52.7kg of HEDP, 96.8kg of citric acid, 30kg of wood pulp sodium lignosulfonate, and 20kg of ammonium chloride , and zinc sulfate heptahydrate 18kg. Turn on the automatic heating system of the reactor, and gradually increase the temperature of the materials in the reactor. When the temperature in the reactor reaches 80°C, turn on the reflux condenser of the reactor, and slowly add 86.5kg of formaldehyde, within 1 hour finished adding. When the reflux condenser starts to reflux, start timing, keep the reflux temperature, and continue to react for 3 hours in the reflux state. After the reaction is completed, sodium lignosulfonate containing polycarboxylic and polyphosphonic acid groups is prepared.

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Abstract

The invention discloses sodium lignosulfonate containing polycarboxyl and polyphosphonic groups as well as a preparation method and application of the sodium lignosulfonate. The preparation method comprises the following specific steps: a) adding water into a glass lining reaction kettle, starting a stirrer, and adding hydrochloric acid and sulfuric acid; b) continuously adding HEDP, sodium lignosulfonate, ammonium chloride, citric acid and zinc salt; c) starting an automatic heating control system, starting a reflux condenser when the temperature of the materials in the kettle is gradually increased to 80 DEG C, and slowly adding formaldehyde within 1 hour; d) when the reflux condenser starts to reflux, keeping the reflux temperature, and continuously reacting for 3-4 hours to prepare thesodium lignosulfonate containing the polycarboxyl and the polyphosphonic acid group. The molecular structure of the compound has functional groups with different chelation effects, and the differentfunctional groups have synergistic interaction, have good exchange, dispersion and adsorption properties, and can be used as a scale and corrosion inhibitor, a scale and corrosion inhibitor and a pre-filming agent in a water treatment agent for a circulating cooling water system.

Description

technical field [0001] The invention belongs to the technical field of macromolecule chemical industry, and specifically relates to sodium lignosulfonate containing polycarboxyl and polyphosphonic acid groups and a preparation method thereof, and also relates to its use as a scale and corrosion inhibitor in a water treatment agent and a pre-membrane in circulating cooling water applications in the system. Background technique [0002] Sodium lignosulfonate is a by-product of paper industry waste liquid treatment and recovery. It has the advantages of multiple sources, low price, non-toxicity, and easy biodegradation. It is a green and environmentally friendly natural product. It is an organic macromolecule, which is composed of phenylpropane structural units connected by ether bonds and carbon-carbon bonds. The molecular structure is relatively complex, containing chelating groups and organic groups such as sulfonic acid groups, phenolic hydroxyl groups, and methoxybenzene. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C02F5/14C02F103/02
Inventor 彭广志彭波王桂芬
Owner 陕西沃利尔精细化工科技有限公司
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