Method for preparing biodiesel through three-stage selective hydrodeoxygenation

A biodiesel and selective hydrogenation technology, applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of poor product quality, easy scaling of the bed, easy deactivation of catalysts, etc., and reduce condensation coking. , the effect of inhibiting coking and avoiding catalyst deactivation

Active Publication Date: 2021-08-24
江西尊创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a three-stage selective hydrodeoxygenation method for preparing biodiesel, aiming at the problems that the catalyst is easily deactivated during the production process, the bed layer is easily fouled, and the product quality is poor in the current biodiesel preparation method. method

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  • Method for preparing biodiesel through three-stage selective hydrodeoxygenation

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Experimental program
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Embodiment 1

[0061] This embodiment provides a method for preparing biodiesel by three-stage selective hydrodeoxygenation, the method comprising the following steps:

[0062] S1. Coarsely filter and clean the raw material waste oil; then desalinate through electrochemical refining, then settle and discharge sewage through a settling tank, backwash and filter, and obtain the pretreated raw material waste oil;

[0063] Mix the pretreated raw material waste oil with hydrogen and exchange heat in the heat exchange heat recovery equipment, and then add it to the oil tank with a temperature of 200°C, a pressure of 5.5MPa, a reaction volume space velocity of 0.8, and a hydrogen-oil ratio of 820:1. In the first fixed-bed reactor, the hydrogenation saturation reaction is carried out under the action of the catalyst to obtain hydrogenation saturation to generate oil;

[0064] During this process, the reaction temperature is controlled by passing cold hydrogen (circulating hydrogen) into the first fi...

Embodiment 2

[0074] This embodiment provides a method for preparing biodiesel by three-stage selective hydrodeoxygenation, the method comprising the following steps:

[0075] S1. Coarsely filter and clean the raw material waste oil; then desalinate through electrochemical refining, then settle and discharge sewage through a settling tank, backwash and filter, and obtain the pretreated raw material waste oil;

[0076] Mix the pretreated raw material waste oil with hydrogen and exchange heat in the heat exchange heat recovery equipment, and then add it to a gas tank with a temperature of 240°C, a pressure of 5.9MPa, a reaction volume space velocity of 1, and a hydrogen-oil ratio of 850:1. In the first fixed-bed reactor, the hydrogenation deoxygenation saturation reaction is carried out under the action of the catalyst to obtain hydrogenation saturation to generate oil;

[0077] During this process, the reaction temperature is controlled by passing cold hydrogen (circulating hydrogen) into th...

Embodiment 3

[0087]This embodiment provides a method for preparing biodiesel by three-stage selective hydrodeoxygenation, the method comprising the following steps:

[0088] S1. Coarsely filter and clean the raw material waste oil; then desalinate through electrochemical refining, then settle and discharge sewage through a settling tank, backwash and filter, and obtain the pretreated raw material waste oil;

[0089] Mix the pretreated raw material waste oil with hydrogen and exchange heat in the heat exchange heat recovery equipment, and then add it to a gas tank with a temperature of 280°C, a pressure of 6.5MPa, a reaction volume space velocity of 1.1, and a hydrogen-oil ratio of 870:1. In the first fixed-bed reactor, the hydrogenation deoxygenation saturation reaction is carried out under the action of the catalyst to obtain hydrogenation saturation to generate oil;

[0090] During this process, the reaction temperature is controlled by passing cold hydrogen (circulating hydrogen) into t...

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Abstract

The invention belongs to the technical field of biodiesel preparation, and discloses a method for preparing biodiesel through three-stage selective hydrodeoxygenation. The method comprises the following steps: mixing pretreated raw material waste grease with hydrogen, performing heat exchange, and adding the mixture into a first fixed bed reactor at the temperature of 200-280 DEG C for hydrogenation saturation; then, adding the mixture into a second fixed bed reactor, and carrying out hydrodemetallization on a first bed layer at the temperature of 310-360 DEG C; carrying out hydrodeoxygenation on a second bed layer at the temperature of 330-380 DEG C; and finally, adding the mixture into a third fixed bed reactor at the temperature of 345-380 DEG C, performing hydrodesulfurization, and performing post-treatment to obtain the biodiesel. According to the invention, the hydrogenation process is divided into three stages; the selectivity of hydrogenation saturation, hydrodeoxygenation and hydrofining is increased by grading the catalyst and controlling the reaction temperature of each section; therefore, the biodiesel quality is improved, catalyst deactivation is effectively avoided, and the problem of bed scaling is avoided.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, and in particular relates to a three-stage selective hydrodeoxygenation method for preparing biodiesel. Background technique [0002] At present, biodiesel usually adopts esterification or transesterification technology, and the product is mainly fatty acid methyl ester, which has poor quality, low calorific value, high acid value, small miscibility ratio, and high production cost. It cannot be used independently, and the mixing ratio is too small. , the market is unacceptable. [0003] Although the fixed bed cracking deoxidation process technology has greatly improved the product quality, fatty acid methyl esters have been eliminated. However, since the reaction and regeneration are switching operations, the heat cannot be comprehensively utilized, and the energy consumption and production cost of the device remain high. The product structure (low-quality gaseous by-products and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00C10G45/02
CPCC10G3/50C10G3/46C10G45/02C10G2300/202Y02P30/20Y02E50/10
Inventor 刘洪崔华礼
Owner 江西尊创新能源有限公司
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