CN103804594A

CN103804594A - Synthesis process for poly MA (Maleic Anhydride)-AA (Acrylic Acid)-Mac (Methyl Acrylate) anti-scaling agent based on control of monomer ratio

Info

Publication number: CN103804594A
Application number: CN201210484193.3A
Authority: CN
Inventors: 谭勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-11-13
Filing date: 2012-11-13
Publication date: 2014-05-21

Abstract

The invention discloses a synthesis process for a poly MA (Maleic Anhydride)-AA (Acrylic Acid)-Mac (Methyl Acrylate) anti-scaling agent based on control of a monomer ratio. The synthesis process comprises the following steps: (a) at first, respectively preparing a maleic anhydride solution, an acrylic acid solution and methyl acrylate; (b) secondly, adding the maleic anhydride solution, the acrylic acid solution and the methyl acrylate in a reaction container, and controlling a weight ratio of MA to AA to Mac to be (0.8-1.2): (0.6-1.0): (0.5-0.7); and (c) thirdly, turning on a stirring and heating device; and naturally cooling after a constant-temperature stirring reaction for a while, so as to obtain a target product. The synthesis process provided by the invention can be used for rapidly preparing the poly MA-AA-Mac anti-scaling agent and has the advantages of simple preparation course and high preparation conversion rate; the preparation cost of a maleic anhydride-acrylic acid-methyl acrylate copolymer can be greatly reduced; and furthermore, the anti-scaling property of the target product can be improved by controlling the monomer ratio in the synthesis process.

Description

Based on the poly-MA-AA-Mac scale inhibitor synthesis technique of controlling monomer ratio

Technical field

The present invention relates to a kind of poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio.

Background technology

Scale remover is a kind of incrustation scale of removing, and the chemicals of the multiple dirt stain such as dirt, generally forms by various ingredients is composite.Industrial scale remover is mainly used in removing heat-exchange equipment, the dirt in boiler etc.

The conventional kind of scale remover and feature thereof:

(1) inorganic polyphosphate.This type of is the scale remover using the earliest, and external oneself restriction is used.In its molecule, there is the P-O-P key of one or more repetitions to exist, can be divided into chain poly-phosphate and cyclic polyphosphates.The shortcoming of inorganic polyphosphate is that moisture-sensitive hydrolysis generates orthophosphoric acid salt, under high temperature and high pH value, more so, reacts and fouling as Ca2+, Mg2+ etc. with divalent cation.

(2) organophosphate.The machine phosphoric acid ester of common are has monoalkyl phosphoric acid esters, bisalkyl phosphate, pyrophosphate, polyoxyethylene aliphatic ether phosphoric acid ester etc.In organophosphate, P-O-C key is stronger than phosphoric acid salt P-O-P key, and therefore it is than phosphate-stabilized, and hydrolysis temperature is higher than phosphoric acid salt.Seemingly, when use, consumption is unsuitable too high for the much character of phosphoric acid ester and phosphoric acid salt, the too high dirt that easily generates on the contrary.Phosphoric acid ester easily adheres to equipment surface, good with the consistency of inhibiter etc., but easily there is emulsification with oils, so need to add non-emulsifier while use in oil field, hydrolysis phenomenon that can be resemble inorganic polyphosphate in the time that temperature exceedes 90 ℃, its hydrolysate also can react and fouling with divalent metal.Strontium Sulphate white crystalline powder.Odorlessness.1g is dissolved in about 8800ml water, 700ml3% nitric acid, 800ml2% hydrochloric acid, is slightly soluble in alkali chloride solution, concentrated acid, is insoluble to ethanol and dilute sulphuric acid.Relative density 3.96.1605 ℃ of fusing points.Refractive index 1.624.

(3) organic multicomponent phosphonic acids.C-P key in phosphonic acids is firm, therefore has higher chemical stability and thermostability, also difficult hydrolysis under high temperature, high pH value condition, nontoxic or low toxicity.For example ethylenediamine tetraacetic methene phosphoric acid still can keep its activity under the high temperature of 200 ℃ and 1013kPa; Carboxyl ethylene-diphosphonic acid just decomposes under the high temperature of 250 ℃.Such scale remover is effective, and dosing is little, and has corrosion inhibition concurrently.Oneself is widely used in oil-field water processing.

(4) aminopolycanboxylic acid's salt.Aminopolycanboxylic acid's salt is a kind of scale remover of better heat stability, as the use temperature of EDTA can reach 200 ℃.This type of scale remover is mainly that the amount therefore adding is many by huge legendary turtle cooperation antiscale, and cost is high, so use and be restricted in the commercial run of a large amount of waters.

Scale remover is made up of Multiple components, comprises the compositions such as organic complexing agent, tensio-active agent, scale inhibitor.The poly-MA-AA-Mac synthesizing as monomer take maleic anhydride (MA), vinylformic acid (AA), methyl acrylate (Mac) can be used as scale inhibitor and uses, and its anti-scaling property is good.In the process of synthetic poly-MA-AA-Mac scale inhibitor, there is very large impact to the performance of the target product synthesizing in different monomer ratios, and a kind of applicable monomer ratio of how to confirm, seems particularly important.

Summary of the invention

The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio is provided, the method can be prepared poly-MA-AA-Mac scale inhibitor fast, and preparation process is simple, prepare transformation efficiency high, greatly reduce the preparation cost of maleic acid anhydride-propenoic acid-methyl acrylate copolymer, and by controlling the monomer ratio in building-up process, thereby the anti-scaling property of target product improved.

Object of the present invention is achieved through the following technical solutions: a kind of poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio, comprises step:

(a) first, prepare respectively maleic anhydride solution, acrylic acid solution and methyl acrylate;

(b) then, in reaction vessel, add maleic anhydride solution, acrylic acid solution and methyl acrylate, and by mass, control MA: AA: MAc=0.8～1.2: 0.6～1.0: 0.5～0.7;

(c) then start and stir and heat riser, keep stopping after constant temperature stirring reaction for some time, naturally cooling, obtains target product.

Described container is the four-necked bottle with whipping appts, dropping funnel, thermometer and condensing works.

Described three dropping funnels are respectively charged into acrylic acid solution, methyl acrylate and ammonium persulfate solution.

As a kind of mode of priority of the present invention, by mass, control MA: AA: MAc=0.8: 0.6: 0.5.

As another kind of mode of priority of the present invention, by mass, control MA: AA: MAc=1.2: 1.0: 0.7.

As the third mode of priority of the present invention, by mass, control MA: AA: MAc=1: 0.8: 0.6.

In sum, the invention has the beneficial effects as follows: can prepare fast poly-MA-AA-Mac scale inhibitor, and preparation process is simple, prepare transformation efficiency high, greatly reduce the preparation cost of maleic acid anhydride-propenoic acid-methyl acrylate copolymer, and by controlling the monomer ratio in building-up process, thereby improve the anti-scaling property of target product.

Accompanying drawing explanation

Fig. 1 is the schematic diagram that is related to of different monomers proportioning and antiscaling rate.

Embodiment

Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.

Embodiment:

A kind of poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio the present invention relates to, comprises step:

In order to obtain best monomer ratio, the present invention has been the contrast experiment of different monomers proportioning, fixing initiator dosage is 10% of monomer total mass, temperature of reaction is 85 ℃, reaction times is 4h, investigate the impact of different monomers proportioning on product anti-scaling property, result is as Fig. 1, as shown in Figure 1: its antiscaling effect of the synthetic product of different monomer ratios is also different, in the time that monomer ratio is n (MA): n (AA): n (MAc)=1: 0.8: 0.6, antiscaling effect the best of the multipolymer scale inhibitor of gained.This is due to the chelating degree that contains carboxyl in multipolymer and contribute to improve multipolymer and Ca2+, in the time that in multipolymer, carboxyl-content is more, improve the antiscale calcium carbonate scale performance of multipolymer, the appropriate ester group of simultaneously introducing has certain dissemination to multipolymer, improve the anti-scaling property of multipolymer, but the introduction volume of ester group is suitable, excessive ester group can cause the water-soluble bad of multipolymer, and less ester group does not have again dissemination to multipolymer.

The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, every foundation technical spirit of the present invention, and any simple modification, equivalent variations that above embodiment is done, within all falling into protection scope of the present invention.

Claims

1. the poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio, is characterized in that, comprises step:

2. the poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio according to claim 1, is characterized in that, described container is the four-necked bottle with whipping appts, dropping funnel, thermometer and condensing works.

3. the poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio according to claim 2, is characterized in that, described three dropping funnels are respectively charged into acrylic acid solution, methyl acrylate and ammonium persulfate solution.

4. the poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio according to claim 1, is characterized in that, by mass, controls MA: AA: MAc=0.8: 0.6: 0.5.

5. the poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio according to claim 1, is characterized in that, by mass, controls MA: AA: MAc=1.2: 1.0: 0.7.

6. the poly-MA-AA-Mac scale inhibitor synthesis technique based on controlling monomer ratio according to claim 1, is characterized in that, by mass, controls MA: AA: MAc=1: 0.8: 0.6.