CN1237081C - Hydrolysis method in technique for synthesizing polyacrylamide with super molecular weight - Google Patents
Hydrolysis method in technique for synthesizing polyacrylamide with super molecular weight Download PDFInfo
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- CN1237081C CN1237081C CN 02146699 CN02146699A CN1237081C CN 1237081 C CN1237081 C CN 1237081C CN 02146699 CN02146699 CN 02146699 CN 02146699 A CN02146699 A CN 02146699A CN 1237081 C CN1237081 C CN 1237081C
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Abstract
The present invention relates to a hydrolysis method in the technique for synthesizing polyacrylamide with super molecular weight. An aqueous acrylamide solution is polymerized to form colloidal matter; the colloidal matter are granulated by a granulating apparatus; then the colloidal granules solid alkali of which the purity is from 70% to 99.99% are mixed and heated and then are hydrolyzed at temperature of 60 DEG C to 95 DEG C. The alkalization proportionality range is from 0.2% to 10%. A mixer of a hydrolyzer mixes the materials entering the hydrolyzer, and simultaneously, a cylinder body of the hydrolyzer is provided with a jacket; the materials are heated by a heating medium (the temperature is lower than 150 DEG C), which makes the molecular weight of the polyacrylamide reach more than 28000000, the dissolving speed of the product less than 2 hr and the viscidity more than 70mPa. s. The polyacrylamide is compounded by aqueous solution of which the degree of mineralization is 4000, but the viscidity is equivalent to that of the polyacrylamide compounded by polluted water of which the molecular weight is 12000000 and the degree of mineralization is 1000; moreover, the viscidity reaches more than 40mPa. The difficult problem of using the polluted water of the oil fields to compound polymers is solved.
Description
Technical field:
The present invention relates to produce hydrolysis and granulation process in the polyacrylamide series product technological process, gather specifically, is the method for hydrolysis in a kind of super high molecular weight polyacrylamide synthesis technology.
Background technology:
At present, the method for synthetic polyacrylamide has three kinds: 1. homopolymerization cohydrolysis technology, though this method technology is simple, but exist material purity requirement height, polymeric chain stops fast, is difficult for producing the shortcoming of high molecular weight products, and general molecular weight is between 500~1500; 2. copolymerization process, though this method does not need hydrolysis, to material purity, especially acrylamide requires highly, is difficult to obtain high molecular weight products, molecular weight is generally 1500~2,000 ten thousand, also easily produces crosslinkedly not to dissolve; 3. polymerization posthydrolysis technology, though that this method requires material purity is not high, because of polyacrylamide is the poor conductor of heat, temperature is difficult to reach hydrolysising condition, still can not obtain more high-molecular weight polyacrylamide, what its molecular weight was the highest reaches 2,400 ten thousand.
Summary of the invention
The purpose of this invention is to provide a kind of molecular weight that obtains up to more than 2,800 ten thousand, and the method for hydrolysis in the super high molecular weight polyacrylamide synthesis technology of favorable solubility polyacrylamide amine product.
The present invention is achieved in that
This process using be: acrylamide solution carries out polyreaction earlier and becomes glue, use granulating equipment with the colloid granulation, then and solid base (purity is 70%~99.99% sodium hydroxide or potassium hydroxide even-granular or sheet, powdery highly basic) mix stirring heating 60 ℃~95 ℃ hydrolysis.Adding the alkali proportional range is: with respect to 0.2%~10% of polyacrylamide weight, optimum turns to 3.66%~4.00%.Idiographic flow is: be reacted into colloidal polyacrylamide blob of viscose and carry out granulation by granulating equipment, particle diameter is at 2~6mm, then colloid is transported in the hydrolyzer, the agitator of hydrolyzer stirs the material that enters in the hydrolyzer, the hydrolyzer cylindrical shell is provided with chuck simultaneously, heats to material by heating medium (<150 ℃).Last material is emitted by bottom discharge openings.
Developing the anti-salt type super high molecular weight polyacrylamide is for satisfying oil field high-level efficiency, the low-cost needs that recover the oil, the extraction produced-water reinjection that is recovered the oil in the oil field, reduced environmental pollution, saved the substantial contribution of disposing of sewage, and this product is significant aspect drilling well, well cementation and water treatment.
Prepared anion-polyacrylamide in the past three kinds of methods arranged: after 1. adding alkali in the acrylamide solution and adjusting pH value, carry out homopolymerization, in the middle and later periods maturing process of reaction by reacting the intensification hydrolysis.This method requires low to material purity, can reduce production costs, and more high-molecular weight anionic polyacrylamide product is very difficult for producing at the anionic polyacrylamide product below 1,500 ten thousand but this method can only obtain molecular weight.2. acrylamide and vinylformic acid, yellow soda ash etc. carry out copolyreaction.This method does not need hydrolytic process, but water-soluble bad, and the molecular weight of product is also in 1,800 ten thousand.3. acrylamide solution is carried out polyreaction earlier and become glue, with adding highly basic such as sodium hydroxide or potassium hydroxide after the water dissolution, heating hydrolysis is the anion-polyacrylamide colloid of preparation with the organic solvent dissolution precipitation more again.Its technical process is: dissolve polymer colloid → add alkali heating hydrolysis → precipitation → drying → pulverizing → finished product.Though this method can obtain molecular weight above the polymeric articles more than 2,000 ten thousand, but after generating colloid in the water dissolution process, owing to so the water-soluble bad even molecular weight product of influenced productions of hydrolysis reaction that makes of colloidal solution density unevenness that makes of the colloid that does not have hydrolysis is difficult to surpass 2,500 ten thousand, thus other performances such as its viscosity also difficulty reach a new level; Its technical process complexity in addition utilizes the dehydration that also must consider solvent itself in dissolving that alcohols or acetone equal solvent carry out material and the precipitation process to separate and the problem of recycling.
And the present invention be directly sneak into by a certain percentage after the blob of viscose granulation that reaction is generated solid base be hydrolyzed dry then, pulverize, go out finished product.And more superior be to utilize this method can produce molecular weight at the anion-polyacrylamide product more than 2,800 ten thousand, and product property is stable, impurity is few, and is water-soluble fabulous.
Utilize the anti-salt type polyacrylamide product of this explained hereafter all can reach following index:
Sequence number | Project | Unit | Index |
1 | Solid content | % | >88 |
2 | Degree of hydrolysis | % | 23-27 |
3 | Insolubles | % | ≤0.2 |
4 | Dissolution rate | h | <2 |
5 | Sewage viscosity | mPa.s | ≮40 |
Description of drawings
Accompanying drawing is preparation method's schema of the present invention.
Embodiment
Embodiment provided by the invention is as follows:
Embodiment 1:
The hydrolytic process of this technology is described with 5 12 tons/stills below.
At first give the heating of hydrolyzer chuck, temperature rises to about 50 ℃~70 ℃ in the question response device, start the hydrolyzer agitator, start hydrolyzer charging blower fan, deliver in the hydrolyzer with the defeated material blower fan polyacrylamide colloid particle of granulation, material heat temperature raising in the hydrolyzer is when temperature rises to 50~70 ℃, adding solid-state granular alkali purity is 99.96%, as to add the alkali ratio be 12000 * 3.66%/99.96%=439.2kg by 3.66% add-on of colloid weight.After grain alkali added, micelle entered hydrolyzed state, carries out after hydrolysis in 0.5-2 hour is finished material being drawn off when hydrolysis, carries out drying treatment, grinds then, sieves, packs.
Treatment capacity kg | Add alkali ratio % | Add alkali number kg | Hydrolysis temperature ℃ | Hydrolysis time h | Sewage viscosity mPa.s | Degree of hydrolysis % | Insolubles % |
12000 | 2.00 | 240. 0 | 90 | 0.5-2 | 26 | 14.2 | 0.44 |
12000 | 3.24 | 388. 8 | 90 | 0.5-2 | 41 | 23.0 | 0.19 |
12000 | 3.66 | 439. 2 | 90 | 0.5-2 | 44 | 26.0 | 0.18 |
12000 | 3.80 | 456. 0 | 90 | 0.5-2 | 45 | 27.0 | 0.19 |
12000 | 5.00 | 600. 0 | 90 | 0.5-2 | 34 | 35.5 | 0.21 |
Embodiment 2:
Verify these technological processs with 54 tons/still reactions:
Whole technological process and 12 tons/still reacting phase with, adding solid-state grain alkali purity and be 99.96% is 4000 * 3.66%/99.96=146.4kg as if adding alkali by 3.66% of colloid weight.The gained result is as follows:
Treatment capacity kg | Add alkali ratio % | Add alkali number kg | Hydrolysis temperature ℃ | Hydrolysis time h | Sewage viscosity mPa.s | Degree of hydrolysis % | Insolubles % |
4000 | 2.00 | 80.0 | 90 | 0.5-2 | 24 | 14.0 | 0.37 |
4000 | 3.24 | 129. 6 | 90 | 0.5-2 | 41 | 23.2 | 0.17 |
4000 | 3.66 | 146. 4 | 90 | 0.5-2 | 46 | 25.7 | 0.14 |
4000 | 3.80 | 152. 0 | 90 | 0.5-2 | 44 | 27.0 | 0.19 |
4000 | 5.00 | 200. 0 | 90 | 0.5-2 | 35 | 36.5 | 0.24 |
The invention of this technology, Molecular Weight for Polyacrylamide is reached more than 2,800 ten thousand, the product dissolution rate was less than 2 hours, more than the viscosity 70mPa.s, the preparation of the 4000 salinity aqueous solution, viscosity are equal to molecular weight 1,200 ten thousand 1000 salinity sewage preparation effect and all reach more than the 40mPa.s, have solved the difficult problem of Daqing oil field sewage prepared polymer, save a large amount of fresh waters, reduced sewage discharge.Social benefit and remarkable in economical benefits.
Claims (3)
1. the method for hydrolysis in the super high molecular weight polyacrylamide synthesis technology; it is to become glue by polymerization of aqueous solution of acrylamide; granulation; the reaction that is hydrolyzed then prepares; it is characterized in that adopting purity is that 70~99.99% solid base mixes with the acrylamide micelle; heated and stirred in hydrolysis reactor; the add-on of solid base is 0.2~10% of a polyacrylamide weight; Heating temperature is 60~95 ℃; hydrolysis time is 0.5~2 hour; carry out drying treatment after hydrolysis is finished, obtain molecular weight at the anionic ultra-high molecular weight anti-salt polyacrylamide product more than 2,800 ten thousand through grinding screening.
2. according to the method for hydrolysis in the described super high molecular weight polyacrylamide synthesis technology of claim 1, it is characterized in that: the solid-state soda ash of employing can be solid-state sodium hydroxide or potassium hydroxide, and its form is granular, sheet or powdery.
3. according to the method for hydrolysis in the described super high molecular weight polyacrylamide synthesis technology of claim 1, it is characterized in that: the solid-state soda ash of employing, the add-on of its solid base are 3.66~4.00% of polyacrylamide.
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US8385043B2 (en) | 2006-08-28 | 2013-02-26 | Avago Technologies ECBU IP (Singapoare) Pte. Ltd. | Galvanic isolator |
US8427844B2 (en) | 2006-08-28 | 2013-04-23 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Widebody coil isolators |
US8436709B2 (en) | 2006-08-28 | 2013-05-07 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Galvanic isolators and coil transducers |
US9019057B2 (en) | 2006-08-28 | 2015-04-28 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Galvanic isolators and coil transducers |
US9105391B2 (en) | 2006-08-28 | 2015-08-11 | Avago Technologies General Ip (Singapore) Pte. Ltd. | High voltage hold-off coil transducer |
US8237534B2 (en) | 2007-05-10 | 2012-08-07 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Miniature transformers adapted for use in galvanic isolators and the like |
US8258911B2 (en) | 2008-03-31 | 2012-09-04 | Avago Technologies ECBU IP (Singapor) Pte. Ltd. | Compact power transformer components, devices, systems and methods |
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