Hydrogenation method for preparation of biodiesel

A biodiesel and hydrogen preparation technology, which is applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of high freezing point and cold filter point, cannot be used, and limit the scope of application, so as to reduce the pressure difference between inside and outside. , prolong the service life, reduce the effect of wall thickness

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] The product obtained after hydrogenation of vegetable oil has a high cetane number, but its freezing point and cold filter point are high, so it cannot be used at low temperature, which limits its application range

Method used

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  • Hydrogenation method for preparation of biodiesel

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Effect test

Embodiment 1～2

[0036] The hydrofining catalyst is FF-36, the hydrodepressing catalyst is catalyst FDW-3, the process flow adopts the method of the present invention, the raw material oil is common commercially available soybean salad oil, and the reaction conditions and test results are shown in Table 3.

[0037] Table 2 Main properties of soybean oil

[0038] project Soybean oil Density(20℃) / g×cm -3 0.9198 Refraction, 20℃ 1.4742 Ash / wt% 0.018 C / H,wt% 79.13 / 11.87 S / N, μg·g -1 2.7 / 61.0 O, wt% 8.991 Freezing point / ℃ -12

[0039] Table 3 Test results

[0040] Example 1 Example 2 Process conditions catalyst FF-36 / FDW-3 FF-36 / FDW-3 Reaction pressure / MPa 8 8 Average reaction temperature / ℃ 330 / 330 330 / 330 Volumetric space velocity / h -1 1.0 / 0.8 1.0 / 0.6 Hydrogen oil volume ratio, v / v 1000 / 600 1000 / 600 Water generation rate, wt% 7.99 8.15 Yield of each fraction*, wt% ...

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Abstract

The invention discloses a hydrogenation method for the preparation of biodiesel, comprising the following steps of: hydrofinishing plant oil, allowing a hydrofinishing effluent to enter a gas-liquid separation device over a hydrodewaxing reactor for gas-liquid separation; redistributing the separated refined oil through a tray, allowing the refined oil and hydrogen to pass through a hydrodewaxing catalyst bed in a countercurrent way, and separating the hydrodewaxed oil to obtain the biodiesel product. The biodiesel produced by the method has characteristics of high cetane number, low sulfur content and low condensation point and the like. The method can be coupled with catalytic hydrogenation oil refining process. Without changing process flow and equipment and by the adoption of proper technological operation conditions, mixed refining process of biodiesel and inferior diesel oil is realized.

Description

technical field [0001] The invention relates to a method for preparing biodiesel, in particular to a method for producing biodiesel by adopting a serial hydrogenation treatment process. Background technique [0002] In order to cope with the depletion of petroleum resources and solve the pollution problems generated during the use of petroleum, countries around the world are actively exploring clean, environmentally friendly and renewable alternative energy sources. Among many raw materials, vegetable oil has become one of the most important sources for the production of synthetic fuels and chemicals in the 21st century due to its excellent properties (almost no sulfur, nitrogen, metals, etc.). [0003] Vegetable oil is generally composed of saturated and unsaturated fatty acid esters with an even number of carbon atoms. Its special structural composition determines that it can be used as a substitute for petroleum to produce fuel oil and chemical products. At present, as a...

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 彭冲于淼曾榕辉黄新露白振民
Owner CHINA PETROLEUM & CHEM CORP
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