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Polymethylacrylic acid higher ester pour point depressant, and preparation method and application thereof

A technology of polymethacrylic acid and methacrylic acid, which is applied in the direction of fuel additives, liquid carbon-containing fuels, fuels, etc., can solve the problems of poor optical properties of products, long process flow, etc., and achieve the effect of simple and feasible methods and broad application prospects

Active Publication Date: 2018-06-29
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a kind of polymethacrylic acid high-grade ester pour point depressant, preparation method and application, overcome the traditional production method process flow is long, the product that adopts the suspension polymerization method to obtain Disadvantages such as poor optical properties give full play to the advantages of late transition metal complexes with good tolerance to polar monomers and can be used as catalysts for the polymerization of polar monomers

Method used

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  • Polymethylacrylic acid higher ester pour point depressant, and preparation method and application thereof
  • Polymethylacrylic acid higher ester pour point depressant, and preparation method and application thereof
  • Polymethylacrylic acid higher ester pour point depressant, and preparation method and application thereof

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Embodiment 1

[0031] A kind of polymethacrylic acid advanced ester type pour point depressant, polymerization reaction formula is as shown in formula (I) and formula (II):

[0032]

[0033] The invention uses the asymmetric bis-Schiff base late transition metal complex as a catalyst and azobisisobutyronitrile or benzoyl peroxide as an initiator to catalyze the homopolymerization or copolymerization of higher esters of methacrylic acid under anhydrous and oxygen-free conditions. , to obtain the polymers represented by the corresponding formulas (I) and (II), and used for depressing the diesel fraction and the lubricating oil fraction, the effect is obvious.

Embodiment 2

[0034] Embodiment 2: a kind of preparation method of polymethacrylic acid advanced ester type pour point depressant, comprises the following steps:

[0035] 1) For refining of lauryl methacrylate, add 200 ml of commercially available lauryl methacrylate and 2 grams of CaH to a 500 ml round bottom flask 2 , zeolite and magneton at room temperature and stirred for 10 hours to remove the polymerization inhibitor therein. Carry out underpressure distillation then, the lauryl methacrylate after the gained refining is sealed and kept at low temperature;

[0036] 2) For the polymerization of lauryl methacrylate, add 0.0054 mmol of 2-hydroxy-3,5-di-tert-butyl-benzaldehyde-o-phenylenediamine-Ni-salicyl to a 100ml pre-dried polymerization reaction tube Aldehyde as catalyst, 0.0027mmol initiator azobisisobutyronitrile, through Schlenk device, replace oxygen three times with 99.99% high-purity nitrogen, add 2.5ml pre-treated lauryl methacrylate, 5ml toluene, in nitrogen atmosphere Lower...

Embodiment 3

[0040] A preparation method of polymethacrylic acid advanced esters pour point depressant, comprising the following steps:

[0041] 1) For the refining of advanced methacrylic acid esters, add 300ml or corresponding quality of commercially available advanced methacrylic acid esters and 5 grams of CaH to a 500ml round bottom flask 2 , zeolite and magneton at room temperature and stirred for 15 hours to remove the polymerization inhibitor therein, then carry out vacuum distillation, and the obtained refined methacrylic acid high-level esters are sealed and stored at low temperature;

[0042]2) Polymerize the higher esters of methacrylic acid prepared in step 1), add 0.0108mmol of catalyst and 0.054mmol of initiator benzoyl peroxide into a 100ml pre-dried polymerization reaction tube, pass through the Schlenk device, use Replace oxygen with 99.99% high-purity nitrogen three times, add pre-treated 5ml or corresponding quality methacrylic acid advanced ester monomer and 10ml benzen...

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Abstract

A polymethylacrylic acid higher ester pour point depressant has polymerization reaction formulas shown in the formula (I) and the formula (II) defined in the specification. A preparation method comprises the steps: a synthetic asymmetric double-Schiff alkali metal complex (nickel system, copper system and other post-transition metal complexes) as a main catalyst, a catalytic system is formed fromthe complex and azodiisobutyronitrile or benzoperoxide, and methacrylate higher ester monomers are catalyzed to undergo a polymerization reaction to produce the polymethylacrylic acid higher ester polymer under certain conditions. The polymethylacrylic acid higher ester polymer prepared by the method has a certain pour point depressing effect on diesel distillates or lubricating oil fractions andis used as a pour point depressant for diesel or lubricating oil.

Description

technical field [0001] The invention belongs to the technical field of petroleum product additives, and in particular relates to a polymethacrylic acid high-grade pour point depressant, a preparation method and an application. Background technique [0002] With the shortage of petroleum resources, the petroleum mined in my country has high wax content, and the diesel oil and lubricating oil produced from this raw material also contain high wax content, which will crystallize and precipitate under low temperature conditions, seriously affecting the performance of oil products. In order to improve the performance of the oil, it is necessary to use additives to lower its freezing point and improve its low temperature fluidity. The function of the pour point depressant is to lower the freezing point of the oil, and it is generally an oil-soluble polymer. The reason why the pour point depressant can lower the freezing point and pour point of the oil is that its alkyl side chain c...

Claims

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Application Information

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IPC IPC(8): C08F20/18C08F120/18C08F4/80C10L1/196C10L10/14
CPCC08F4/80C08F20/18C08F120/18C08F220/18C08F220/1818C10L1/196C10L10/14
Inventor 丁丽芹李孟阁
Owner XI'AN PETROLEUM UNIVERSITY
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