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Refining method for biodiesel coarse product

A technology of biodiesel and refining method, which is applied in the field of refining biodiesel crude products, and can solve the problem that the removal of light components cannot be guaranteed.

Active Publication Date: 2014-08-20
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the method of removing light components by vacuum flash evaporation in the process of refining biodiesel crude products in the prior art, which cannot ensure that the complete removal of light components does not affect the yield of biodiesel products and the biological The defect of diesel oil quality provides a kind of refining method of biodiesel crude product, and described refining method can effectively remove the light component in described biodiesel crude product and can make active component in the biodiesel crude product fully recover and Utilization can effectively improve the yield and quality of biodiesel, and can reduce energy consumption and environmental pollution

Method used

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  • Refining method for biodiesel coarse product
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Examples

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preparation example Construction

[0038] According to the present invention, the source of the crude biodiesel product is not particularly limited, and is generally prepared. The preparation method of the crude product of biodiesel can be the preparation method of various existing biodiesel, and the method of described preparation can usually be under the condition of transesterification reaction, the raw material grease and the low-carbon alcohol of C1-C4 contact reaction Obtain biodiesel crude product. Wherein, the transesterification reaction conditions may be conventional transesterification reaction conditions for preparing biodiesel in the art. For example, the transesterification reaction conditions include: a pressure of 6-8.5 MPa (gauge pressure) and a temperature of 240-280° C.; preferably, a pressure of 6-7 MPa (gauge pressure) and a temperature of 250-260° C. No need for catalyst intervention, the ratio of alcohol to oil is 9-12:1 (molar ratio). For example, the raw oil can be selected from one o...

Embodiment 1

[0043] This embodiment is used to illustrate the refining method of the biodiesel crude product provided by the present invention.

[0044] (1) if figure 1 As shown, the biodiesel crude product is sent to the first distillation tower for methanol distillation. The conditions of methanol distillation include: the tower top pressure is 20KPa, the tower top temperature is 64°C, the bottom temperature is 86°C, and methanol is extracted from the top of the tower , from the bottom of the tower to remove most of the biodiesel crude product of methanol;

[0045] (2) send the crude biodiesel product after methanol distillation obtained at the bottom of the first distillation tower into a water washing tower for washing, and wash the crude biodiesel product with water. The washing conditions include: the amount of washing water and the crude product of biodiesel The weight ratio of the amount is 0.2:1, the washing temperature is 85°C, and the time is 1.5 hours;

[0046] (3) After the...

Embodiment 2

[0053] This embodiment is used to illustrate the refining method of the biodiesel crude product provided by the present invention.

[0054] (1) if figure 1 As shown, the biodiesel crude product is sent to the first distillation tower for methanol distillation. The conditions of methanol distillation include: the tower top pressure is 20KPa, the tower top temperature is 60°C, the bottom temperature is 80°C, and methanol is extracted from the top of the tower , from the bottom of the tower to remove most of the biodiesel crude product of methanol;

[0055] (2) send the biodiesel crude product after the methanol distillation that obtains at the bottom of the first distillation tower into the water washing tower for washing, and rinse the biodiesel crude product with water. The washing conditions include: the amount of washing water and the biodiesel crude product The weight ratio of the amount is 0.1:1, the washing temperature is 80°C, and the time is 1 hour;

[0056](3) The c...

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Abstract

The invention discloses a refining method for a biodiesel coarse product. The biodiesel coarse product contains biodiesels, C1-C4 low-carbon alcohol, C5-C11 esters compounds and C19-C40 heavy oil. The refining method includes: conveying the biodiesel coarse product performed with low-carbon alcohol distilling and washing into a second distilling tower for light removal and distilling, the light removal and distilling condition leads mixtures containing water, a little of residual low-carbon alcohol and C5-C11 esters compounds and contained in the washed biodiesel coarse product to be extracted through the top of the tower, leads mixture of biodiesel and C19-C40 heavy oil to be extracted through the bottom of the tower, and leads parts of the C5-C11 esters compounds extracted from the top of the second distilling tower to return to the second distilling tower. By adopting the refining method, loss of effective components in the biodiesel can be reduced, yield and purity of the biodiesel are improved, investment cost of devices is reduced, and environment pollution is reduced.

Description

technical field [0001] The invention relates to a method for refining biodiesel crude product. Background technique [0002] Biodiesel is a fatty acid monoester obtained from renewable lipid resources. It is an environmentally friendly fuel that can replace ordinary diesel. It can be mixed with petroleum diesel in any proportion, and it is an environmentally friendly new environmentally friendly energy source and green fuel. . [0003] In the prior art, the preparation methods of biodiesel mainly include dilution method, microemulsion method, pyrolysis method, transesterification method, biotechnology method and the like. The method of industrial production of biodiesel mostly adopts transesterification method (SRCA). The process of producing biodiesel by transesterification method (SRCA) usually needs unit operations such as the esterification reaction of raw oil and low-carbon alcohols, the recovery of low-carbon alcohols, and the refining of crude biodiesel products. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 史国强张庆英王先国郑长波刘强张军涛
Owner CHINA NAT OFFSHORE OIL CORP
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