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Preparation method of epoxysuccinic acid catalyst

The technology of epoxy succinic acid and poly epoxy succinic acid is applied in the production field of scale inhibitor and dispersant poly epoxy succinic acid catalyst, which can solve the problems of easy loss, no fixed system for tungstate catalyst, high cost, and saves Effect of tungstate catalyst

Active Publication Date: 2014-04-30
NANNING TAIDAFENG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in the research on the synthesis process of polyepoxysuccinic acid reported in the above-mentioned open literature, the tungstate catalyst has no fixed system in the system, so it is easy to be lost after a period of reaction, and it needs to be continuously added, resulting in higher cost.

Method used

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  • Preparation method of epoxysuccinic acid catalyst
  • Preparation method of epoxysuccinic acid catalyst
  • Preparation method of epoxysuccinic acid catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, catalyst preparation embodiment:

[0034] 1. Resin pretreatment, choose D209, D296 or D301 styrene macroporous resin, dip and wash, soak with 1N sodium hydroxide solution, wash with water until neutral, soak with 1N hydrochloric acid solution, wash with water until neutral, and then Soak in 1N sodium hydroxide solution and wash with alkali, then wash with water until neutral to obtain a strongly basic anion exchange resin with a pH of 8-10;

[0035] 2. WO 4 2 Adsorption: 1) Pack the strongly basic anion exchange resin with a pH of 8-10 obtained from the pretreatment into the column, wash it with 3-5 times of deionized water, and then wash it with 5% Na 2 WO 4 The solution flows through the resin bed from top to bottom at a flow rate of 0.5 times the bed volume per hour; when the pH value of the outlet reaches above 11, the OH in the resin - started to be WO 4 2- 2) continue to use 5% Na 2 WO 4 The solution flows through the resin bed from top to bo...

Embodiment 2

[0037] Embodiment 2, catalyst preparation embodiment

[0038] Resin pretreatment is identical with embodiment 1, but WO 4 2 The adsorption adopts soaking method, is that the strong basic anion exchange resin that the pH that pretreatment obtains is 8-10 uses weight content 5% Na 2 WO 4 Soak the solution for 1-2 hours, then rinse the resin with deionized water to remove free WO 4 2- , until no white turbidity appears in the effluent with 2% barium chloride solution; the resulting adsorbed WO 4 2- The macroporous resin was filtered to dryness under vacuum condition and used to produce polyepoxysuccinic acid, or stored for future use.

Embodiment 3

[0039] Embodiment 3, catalyst application embodiment:

[0040] 1) Oxidation reaction, add maleic anhydride in the reactor, add NaOH solution with a weight percentage of 50%, adjust the pH value to 8-8.5, and put the adsorbed WO 4 2- Macroporous resin, the amount of macroporous resin is 1-5% of the total weight, and 30% by weight of H 2 o 2 After the dropwise addition, the reaction continued for 0.5-1h. After the reaction, the reaction solution and the resin catalyst were collected; the maleic acid: the weight ratio of hydrogen peroxide was 1:1

[0041] 2) Polymerization reaction, adjust the pH of the reaction solution to 8 and the temperature at 70-95°C, add a composite initiator with a weight content of 5-10%, and polymerize for 1.5-3 hours to obtain polyepoxy amber with a scale inhibition rate greater than 95%. Acid products.

[0042] The resin catalyst after the oxidation reaction described above was re-exchanged with 1N NaOH, washed with alkali and acid, and adsorbed W...

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Abstract

The invention provides a preparation method of an epoxysuccinic acid catalyst. The preparation method comprises the steps of (1) selecting a styrene macroporous resin, preprocessing the selected styrene macroporous resin at first, carrying out alkali washing and acid pickling to obtain a strong-basicity anion exchange resin having the pH ranging from 8 to 10, (2) flowing a prepared 5% Na2WO4 solution through a resin bed from top to bottom, and displacing OH<-1> in the resin with WO4<2->, (3) flushing the resin with deionized water to remove free WO4<2-> until the effluent is detected by a 2% barium chloride solution to be white and have no white pollution, and (4) filtering the obtained WO4<2-> adsorbed macroporous resin under a vacuum condition to dry, and applying the macroporous resin to produce a polyepoxysuccinic acid. After the using effect of the catalyst is reduced, the resin processing and the WO4<2-> adsorption are repeated, and then the styrene macroporous resin can be repeatedly used a plurality of times; the catalyst is good in catalytic effect, and not easy to lose; in addition, compared with the existing epoxysuccinic acid catalyst, the expensive tungstate catalyst can be saved.

Description

technical field [0001] The invention relates to a catalyst, in particular to a method for producing a scale-inhibiting dispersant polyepoxysuccinic acid catalyst. Background technique [0002] Polyepoxysuccinic acid (sodium) is an excellent environment-friendly water treatment scale inhibitor, which is prepared from maleic anhydride through hydrolysis, epoxidation, and polymerization. [0003] As early as the end of the 1950s, George and Paul had discovered that under the condition of sodium tungstate as a catalyst, hydrogen peroxide could make maleic acid generate epoxysuccinic acid under certain reaction conditions. The specific responses are as follows. [0004] [0005] Maleic anhydride Maleic acid (salt) Epoxysuccinic acid (salt) [0006] Hosoi et al. conducted a systematic study on the synthesis of epoxysuccinic acid earlier, and provided a range of suitable reaction conditions (including the pH value of the reaction system, reaction temperature, and reaction time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/22
Inventor 章朝晖贺均林王建平何丽萍李宁刘勇波韦炳前
Owner NANNING TAIDAFENG CHEM CO LTD
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