Method for preparing low temperature epoxy fatty acid branched-chain alcohol ester improver for biodiesel and application thereof

A technology of epoxy fatty acid and branched chain alcohol ester, which is applied in the production of fatty acid, esterification of fatty acid, chemical modification of fatty acid, etc., can solve the problems of low cold filter point effect of biodiesel, and achieve high industrial application value and viscosity. Reduced, high-efficiency effects

Inactive Publication Date: 2011-05-04
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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Problems solved by technology

[0005] In order to solve the shortcoming that the low-temperature improver in the prior art has no obvious effect on reducing the cold filter point of biodiesel, the present invention provides a low-temperature improvement method for preparing epoxy fatty acid branched-chain alcohol ester biodiesel on the basis of the above-mentioned technology. method and its application

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  • Method for preparing low temperature epoxy fatty acid branched-chain alcohol ester improver for biodiesel and application thereof
  • Method for preparing low temperature epoxy fatty acid branched-chain alcohol ester improver for biodiesel and application thereof
  • Method for preparing low temperature epoxy fatty acid branched-chain alcohol ester improver for biodiesel and application thereof

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preparation example Construction

[0031] After the prepared epoxy fatty acid branched chain alcohol ester low-temperature improver is mixed with biodiesel, the low-temperature flow performance is significantly improved, and the condensation point and cold filter point can be reduced by 5-15°C.

[0032] The mass of epoxy fatty acid branched chain alcohol ester accounts for 0.5-3% of biodiesel, and has high industrial application value.

[0033] The natural oils include: soybean oil, cottonseed oil, rapeseed oil, camellia oil, palm oil, catalpa oil, pistachio oil, smooth skin oil, and the content of saturated fatty acid in the raw material is ≤20%wt.

[0034] Described branched chain alcohol is: C3 branched chain alcohol: isopropanol; C4 type branched alcohol: isobutanol sec-butanol; C5 type branched alcohols: 2-methyl-1-butanol, 3-methyl-1-butanol, 2-pentanol, 3-pentanol; C6 type branched chain alcohol: 3,3-dimethyl-1-butanol, 2,3,-dimethyl-1-butanol, 2-ethyl-1-butanol, 2-methyl-1- Pentanol, 3-methyl-1-...

Embodiment 1

[0040] Step 1: Mix natural oil and branched chain alcohol, add catalyst, and react at 45-100°C for 20-120 minutes to obtain fatty acid branched-chain alcohol ester. Among them, the branched alcohol is primary alcohol or secondary alcohol, the number of carbon atoms in the alkyl group is between 3 and 8, and there is no branch on the α carbon atom of the secondary alcohol; the catalyst is an acid such as sulfuric acid, phosphoric acid, p-toluenesulfonic acid, or a catalyst It is an alkali metal hydroxide or an alkoxide of an alkali metal branched alcohol. The molar ratio of the natural oil to the branched alcohol used in the reaction is 1:1-10, and the amount of the catalyst accounts for 0.8-5% of the weight of the oil. The crude product is subjected to conventional vacuum distillation to separate the unreacted branched chain alcohol for recycling, and the remaining product is separated and separated to obtain the upper layer of fatty acid branched chain alcohol ester and the l...

Embodiment 2

[0045] Step 1: Take 100g of soybean oil with an acid value of 0.5 mgKOH / g, 92mL of isopropanol and 1g of concentrated sulfuric acid and put them into a 500mL three-necked flask. Heating to 75°C, reacting for 1.5h, distilling off unreacted alcohol under reduced pressure to obtain fatty acid isopropanol ester.

[0046] Step 2: Take 50g of fatty acid isopropanol ester and 10g of formic acid in a 250 mL three-necked flask, add 1g of concentrated sulfuric acid, stir and heat up to 45°C, then add 60g of 35% hydrogen peroxide dropwise at a rate of 20mL / h; Afterwards, the temperature was raised to 60°C, and the reaction was kept for 4 hours; the crude product was subjected to static phase separation, neutralization, and dehydration to obtain isopropanol ester of epoxy fatty acid.

[0047] Step 3, take 1g of epoxy fatty acid isopropanol ester and 100g of soybean oil biodiesel, mix well, and measure its kinematic viscosity at 40°C as 3.8mm 2 / s, the density at 20°C is 825Kg / m 3 , The ...

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Abstract

The invention discloses a method for preparing a low temperature epoxy fatty acid branched-chain alcohol ester improver for biodiesel and application thereof. The method comprises the steps of taking natural oil and branched-chain alcohol as raw materials to react in the presence of a catalyst, and carrying out distilling, standing and layering on the product to obtain supernatant fatty acid branched-chain alcohol ester; and then mixing the fatty acid branched-chain alcohol ester with formic acid, adding an epoxidation catalyst, reacting while dropwise adding hydrogen peroxide, and carrying out standing, layering, neutralizing and dewatering on the product to obtain epoxy fatty acid branched-chain alcohol ester. The invention develops an epoxy fatty acid branched-chain alcohol ester improver aiming at the characteristics of biodiesel. The method has the following beneficial effects: by branching bonds of fatty acid ester and introducing a polar group onto the interior double bond structure of the fatty acid ester, the improver can be easily mixed with the biodiesel to form uniform solution, thus being beneficial to blocking further growth of solid crystals; and after different oil-based biodiesels and the improver are mixed, the low temperature fluidity of the biodiesels can be obviously improved, the condensation point and cold filter point can be reduced by 5-15 DEG C, the calorific value can be improved, and the viscosity can be reduced.

Description

technical field [0001] The invention belongs to a preparation method of a biodiesel pour point depressant, in particular to a method for improving the low-temperature fluidity of biodiesel by preparing epoxy fatty acid branched chain alcohol ester. Background technique [0002] Biodiesel is an important renewable clean energy, which is generally produced by transesterification or esterification of methanol and oil. Its performance similar to petrochemical diesel, good renewability and environmental performance advantages have also attracted widespread attention. However, due to the influence of long-chain saturated fatty acid components and impurities, the condensation point and cold filter point of biodiesel are relatively high, and the low-temperature fluidity is poor. The precipitation and crystallization will block the engine, so that its practical application is restricted, and the marketization process is greatly improved. stymied. Therefore, it is necessary to condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/00C11C3/10C10L1/19C10L10/14C10L1/02
CPCY02E50/10
Inventor 蒋剑春陈洁聂小安李科常侠
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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