KR20090076234A - Biodiesel having enhanced pour point - Google Patents

Abstract

A biodiesel having an effect of improving pour point and filter plugging point without dropping an ester value is provided. A biodiesel having enhanced pour point comprises 70 to 95% by weight of biodiesel and 5 to 30% by weight of a C18-C54 fatty acid alkylester having one or more carboxy groups. The C18-C54 fatty acid alkylester having one or more carboxy groups is erucic acid alkylester or dimer acid alkylester. The alkyl is selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, and octyl.

Description

Biodiesel with improved pour point {BIODIESEL HAVING ENHANCED POUR POINT}

The present invention relates to biodiesel comprising fatty acid alkyl esters having excellent pour point and filter plugging point properties.

Rapeseed oil is used as the main raw material of biodiesel. Recently, production of biodiesel using low-cost raw materials such as palm is increasing. However, in the case of biodiesel made of palm or the like, the pour point is high, and in cold climates such as Korea, problems occur in the pour point and the filter clogging point, making it difficult to use.

In order to solve this problem, German Patent 10-2000-7005475 was intended to improve the pour point by using a biodiesel additive using oxygen-containing methacrylate to methacrylate or citrol monomer and copolymer, Biomass and Bioenergy 27 (2004) 485-491 used Bio-flow 875, a general diesel pour point improver, to improve the pour point of biodiesel.

However, these fluidity improvers are those applied to biodiesel, which were added to general petroleum diesel, are not suitable for adding to biodiesel, and are difficult to apply due to high cost.

The present invention has been made to solve the above problems, an object of the present invention is to provide a biodiesel containing fatty acid alkyl esters excellent in pour point and filter plugging point properties.

In order to achieve the above object, the present invention improves the pour point, characterized in that it comprises 70 to 95% by weight of biodiesel and 5 to 30% by weight of fatty acid alkyl ester having 18 to 54 carbon atoms, having at least one carboxyl group. It is characterized by providing a biodiesel.

The biodiesel may be any biodiesel produced from common animal and vegetable oils.

In the present invention, as a means for improving the pour point and filter plugging point characteristics of the biodiesel, it is possible to improve the fluidity and filter clogging of the biodiesel without dropping the ester value due to the mixing of the general additives because it is used by mixing a specific fatty acid alkyl ester. Can be.

Biodiesel with improved pour point of the present invention includes 70 to 95% by weight of general biodiesel and 5 to 30% by weight of fatty acid alkyl ester having 18 to 54 carbon atoms, having at least one carboxyl group. If it is less than 5% by weight, the improvement of the pour point and the filter plugging point is hardly seen, and if it exceeds 30% by weight, the additional improvement is insignificant.

The fatty acid alkyl esters of the invention have one or more carboxyl groups, preferably one, two or three.

In addition, the fatty acid alkyl ester of the present invention preferably has 18 to 54 carbon atoms, but when it is out of the above range, there is a problem in that the crystallization occurs easily, thereby weakening the pour point and filter plugging point characteristics.

The fatty acid alkyl ester of the present invention is not particularly limited as long as it has at least one carboxyl group and has 18 to 54 carbon atoms, but is not particularly limited in its kind, but it may be a eruc acid alkyl ester having one carboxyl group or a dimer acid alkyl ester having two carboxyl groups. It is preferable to use.

The fatty acid alkylesters of the present invention may be saturated or unsaturated, preferably unsaturated. In particular, the unsaturated fatty acid alkyl ester can significantly improve the pour point and filter plugging point characteristics of the biodiesel by lowering the content of saturated fatty acids that affect the pour point in the biodiesel to an appropriate level.

The alkyl group of the fatty acid alkyl ester of the present invention may be selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl and octyl, preferably methyl, ethyl or octyl.

Biodiesel with improved pour point according to the present invention can be used in the same ratio as a conventional method using biodiesel, with diesel.

Biodiesel production method with improved pour point of the present invention is a mixture of the general biodiesel produced by the conventional biodiesel production method and the fatty acid alkyl ester of the present invention prepared by the conventional method in the above ratio It may be prepared, and will be described in more detail through the following examples.

Biodiesel according to the present invention as described above has the effect of improving the pour point and filter plugging point characteristics, without dropping the ester value.

Example  One

To 100 g of general soybean cooking oil, 23 g of methanol was added and mixed, followed by 0.5 g of sodium methoxide. After raising the temperature to 60 ~ 65 ℃, it was reacted for 1 hour while stirring. After washing twice, the lower part was removed to prepare general biodiesel.

95 g of the general biodiesel prepared above and 5 g of erucic acid methyl ester were mixed at room temperature for 30 minutes, thereby preparing biodiesel having an improved pour point.

BD20 was obtained by mixing 20 g of diesel fuel with 100 g of biodiesel having improved pour point of the present invention.

Example  2

BD20 was obtained in the same manner as in Example 1 except that 90 g of general biodiesel and 10 g of erucic acid methyl ester were used.

Example  3

BD20 was obtained in the same manner as in Example 1 except that 80 g of general biodiesel and 20 g of eruc acid methyl ester were used.

Example  4

BD20 was obtained in the same manner as in Example 1 except that 70 g of general biodiesel and 30 g of erucic acid methyl ester were used.

Example  5

BD20 was obtained in the same manner as in Example 1 except that dimer acid methyl ester was used instead of erucic acid methyl ester.

Example  6

BD20 was obtained by the same method as Example 1 except for using dimer acid butyl ester instead of erucic acid methyl ester.

Example  7

BD20 was obtained by the same method as Example 1 except that 90 g of general biodiesel and 10 g of dimer acid butyl ester were used.

Example  8

BD20 was obtained by the same method as Example 1 except for using dimer acid octyl ester instead of erucic acid methyl ester.

Comparative example

BD20 was obtained by mixing 100 g of general biodiesel obtained in Example 1 and 20 g of diesel fuel.

The pour point of BD20 obtained from the above Examples 1 to 8 and Comparative Example was measured based on KSM2016, and the filter clogging point was measured based on KSM2411. The results are shown in Table 1 below.

Unit (℃) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Comparative example Pour point -43 -45 -45 -47 -47 -50 -53 -40 13 Filter clogging point -15 -17 -19 -18 -14 -18 -17 -10 25

As can be seen in Table 1, in the case of BD20 (example) prepared from biodiesel mixed with fatty acid alkyl ester according to the present invention, compared to BD20 (comparative example) prepared from general biodiesel, the pour point and filter clogging It can be seen that there is a marked improvement in the point.

Claims (3)

Biodiesel with improved pour point, characterized in that 70 to 95% by weight of biodiesel and 5 to 30% by weight of fatty acid alkyl ester having 18 to 54 carbon atoms having at least one carboxyl group. The biodiesel with improved pour point according to claim 1, wherein the fatty acid alkyl ester having one or more carboxyl groups and having 18 to 54 carbon atoms is eruc acid alkyl ester or dimer acid alkyl ester. The biodiesel with improved pour point according to claim 1 or 2, wherein the alkyl is selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl and octyl.