CN1119653A

CN1119653A - Process for producing sodium polyacrylate

Info

Publication number: CN1119653A
Application number: CN 94116652
Authority: CN
Inventors: 周泽宇; 帅红; 朱英存; 龙海涛
Original assignee: 周泽宇
Priority date: 1994-09-30
Filing date: 1994-09-30
Publication date: 1996-04-03

Abstract

The present invention relates to a technological process for producing sodium polyacrylate. The waste acrylic fibre is used as raw material, and mixed with 20% (wt. concentration) sodium hydroxide with 1:3 proportion, heated to 85-90 deg.C and stirred for 2h. at normal pressure, and after the waste acrylic fibre has been completely dissolved, the ethylenedia-mine is added according to the proportion (by weight) of 1:0.07-0.09 of sodium hydroxide and ethylenediamine, and then stirred for 0.5-1 h. at 85-90 deg.C, thus a colourless transparent slightly viscous sodium polyacrylate solution can be obtained. It is non-toxic, odorless, incombustible non-explosive and chemically stable, it is specially suitable for treatment of high-concentration acidic (pH is less than 3) organic waste water.

Description

The production technique of sodium polyacrylate

The invention belongs to the preparation method of environmental protection, be specifically related to a kind of production technique of sodium polyacrylate with water purification agent.

In the purification and the sewage disposal of feedwater, early stage organic polymer coagulating agent such as the poly amic acid that uses costs an arm and a leg, and application is restricted, and the eighties Germany produces and promoted sodium polyacrylate.Sodium polyacrylate has the good treatment effect for the acidic chemical high concentrated organic wastewater especially as the organic polymer coagulating agent of feedwater and sewage disposal, solved the handling problem of high-concentration acid organic wastewater well, but existing polyacrylic acid process for producing sodium, investment is big, equipment and working condition require high, are unfavorable for extensively promoting the use of.

The object of the present invention is to provide that a kind of raw material is easy to get, the working condition requirement is low, technology is simple, the production technique of the sodium polyacrylate of being convenient to promote.

The production technique of sodium polyacrylate of the present invention may further comprise the steps successively:

1. NaOH is prepared the aqueous solution in reactor, is heated to 80～90 ℃ into about 20%,

2. that will clean and through the useless acrylic fiber of brachymemma in 20%NaOH: useless 3: 1 ratios of acrylic fiber (weight) ≈ are poured among the NaOH of reactor, under normal pressure stir about 2 hours until whole acrylic fibres dissolvings,

3. in the above-mentioned NaOH solution that is dissolved with acrylic fibre, press NaOH: quadrol (weight) ≈ 1: 0.07～0.09 adds quadrol, stirred 0.5～1 hour down at 85～95 ℃, the water white transparency sodium polyacrylate solution of viscosity slightly.

Sodium polyacrylate solution by production technique production of the present invention, be strong basicity, general PH＞14, proportion about 1.2, nontoxic, tasteless, do not fire, not quick-fried, stable chemical performance, be specially adapted to handle the organic waste water of high density acidity (PH " 3), for the acid organic waste water of high density, still do not have the good treatment method, and in the acid organic waste water of high density, add Tai-Ace S 150 earlier at present, behind polyaluminium sulfate or the aluminium chlorohydroxide, after directly dropping into liquid polypropylene acid sodium of the present invention, the flco formation speed is fast, and alumen ustum is big, the sedimentation piece, and decolouring, suspended substance (S.S) CODor removal effect is good, be existing market supply conventional coagulating agent the special efficacy coagulating agent of the incomparable acid organic waste water of high density.

Unique technology that it is raw material that the present invention adopts useless acrylic fibre has not only effectively utilized the refuse of textile of chemical fibre factory, the multiple useless chamber that is, and technology is very simple, production cost is low, and the product of being produced need not handled direct use, has not both had waste water, there is not waste sludge discharge again, be particularly suitable for township and village enterprises and produce, or in-field use, produce in situ.

Embodiment:

In anticorrosion reactor, add 240 kg of water, under agitation add industrial NaOH62 kilogram, be warming up to 85 ± ℃, add cotton 100 kilograms of useless eyeball synthetic fibre, stir 2 hours down until the cotton all dissolvings of eyeball synthetic fibre, add 5 kilograms of quadrols again at 85 ℃, stir about 0.5 hour, finish until reaction, do not have pungent NH3 and emit, get water white sodium polyacrylate thick liquid.

With gained liquid be used to handle PH " 3 dye chemical industry waste water test:

Drop into earlier Tai-Ace S 150, drop into sodium polyacrylate of the present invention again, under the condition of uncomfortable PH, it is big and sedimentation is fast to generate the flco alumen ustum, and supernatant liquor is as clear as crystal immediately, and is good more than any conventional coagulating agent treatment effect.

Claims

1. the production technique of a sodium polyacrylate may further comprise the steps successively:

1) NaOH is prepared the aqueous solution in reactor, is heated to 80～90 ℃ into about 20%,

2) will be through cleaning and through the useless acrylic fibre of brachymemma, by 20%NaOH: useless 3: 1 ratio of acrylic fibre (weight) ≈ is added in the NaOH solution of reactor, and stir about is 2 hours under normal pressure, dissolves until whole acrylic fibres.

2. in the above-mentioned NaOH solution that is dissolved with acrylic fibre, in NaOH: quadrol (weight) ≈ 1: 0.07～0.09 ratio adds quadrol, stirred 0.5～1 hour down at 85～90 ℃, the water white transparency sodium polyacrylate solution of viscosity slightly.