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Process for producing wax-crystal dispersing auxiliary with diesel oil at low-temperature and uses thereof

A technology of dispersing aid and diesel wax, which is applied in the field of preparation of diesel low-temperature wax crystal dispersing aid, can solve the problems of limited use and high cost, and achieve the effect of simple production process

Inactive Publication Date: 2008-07-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production cost of pour point depressants is generally high, which greatly limits its use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Pour 100ml of xylene into a 250ml four-necked flask, add 8.9g of p-tert-butyl benzoic acid, stir and raise the temperature to 50°C, start to add 4.3ml of isopropylamine dropwise, after dropping, react at a constant temperature of 60°C for 2 hours, and evaporate the solvent , Get the dispersion aid. Compound it with T1804B at a mass ratio of 1:1 at 60°C to obtain diesel pour point depressant 1#, and compound with T1804C at a mass ratio of 1:1 to obtain diesel pour point depressant 2#.

Embodiment 2

[0022] Pour 100ml of toluene into a 250ml four-necked flask, add 8.9g of p-tert-butyl benzoic acid, stir and raise the temperature to 50°C, start dripping 3.9ml of isopropanolamine, after the dropwise addition, react at 70°C for 2 hours, and then distill off Solvent to obtain dispersion aid. Compound it with T1804B at a mass ratio of 1:1 at 70°C to obtain diesel pour point depressant 3#, and compound with T1804C at a mass ratio of 1:1 to obtain diesel pour point depressant 4#.

Embodiment 3

[0024] Pour 100ml of xylene into a 250ml four-necked flask, add 8.9g p-tert-butyl benzoic acid, 12.1g cetyl alcohol, 0.21g p-toluenesulfonic acid and reflux at 150°C for 5 hours, neutralize with 5% sodium hydroxide solution and saturate Wash with sodium chloride solution, evaporate the solvent, and dry to obtain the dispersion aid. Compound it with T1804B at a mass ratio of 1:4 at 100°C to obtain diesel pour point depressant 5#, and compound with T1804B at a mass ratio of 1:1 to obtain diesel pour point depressant 6#.

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PUM

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Abstract

A method for preparing a diesel low temperature wax crystal disperser and the application of the disperser belongs to the field of disperser. The preparation method is as follows: mixing an organic carboxylic acid and an aliphatic amine or an aliphatic alcohol according to a quantity ratio of 1:1.5 to 3:1; taking toluene or xylene as a solvent, reacting for 2 to 5 hours at a temperature of 60 DEG C to 150 DEG C, steaming out the solvent to get the disperser. When reacting with aliphatic amine, a needed catalyst is a toluene sulfonic acid. The organic carboxylic acid is a p-tert-butylbenzoic acid or a mixture of dodecanoic acid, myristic acid, hexadecanoic acid and stearic acid according to a quantity ratio of 1:1.15:1.3:1.45. The carbon number of aliphatic amine or aliphatic alcohol is C3 to C8; a blending temperature of the disperser and the present sold diesel low temperature flow modifier is 50 DEG C to 120 DEG C; the quantity ratio is 1:1 to 1:4. The cooperation of the dispersers and the present domestic diesel low temperature flow modifier can more effectively reduce the cold filter plugging point of long distillate diesel and has a certain sensitivity to narrow fraction diesel.

Description

Technical field [0001] The invention is a preparation method of a diesel low-temperature wax crystal dispersion aid, more precisely, a preparation method of a dispersant that improves the dispersibility of a diesel pour point depressant in diesel and improves the low-temperature fluidity of diesel. Background technique [0002] When the diesel engine is working, the diesel fuel passes through the coarse and fine filter, and then through the high-pressure pump, and the fuel is injected into the cylinder through the fuel injection nozzle. At low temperatures, due to the precipitation and accumulation of wax crystals, the function of the duct and filter is hindered, and the diesel system will be affected due to insufficient fuel supply. Generally speaking, in order to solve the problem of low temperature fluidity of diesel, it is often adopted to add low temperature improver. This kind of scheme has become the first choice to solve the low temperature fluidity of diesel due to its l...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/76C07C231/02C07C233/11C10L10/14C10L10/18
Inventor 李仙粉吴坚刘建军任福民
Owner BEIJING UNIV OF CHEM TECH
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