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Treatment method for heat exchanger fouling during biodiesel production process, and preparation method for biodiesel

A technology of biodiesel and a treatment method, which is applied in the field of biodiesel preparation, can solve the problems of fouling and blockage of heat exchangers, increase the operation cycle of heat exchangers, etc., and achieve the effects of high cost efficiency and increase of operation cycle.

Active Publication Date: 2012-07-11
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for heat exchanger fouling and a biodiesel preparation method aimed at the problem that heat exchangers are prone to fouling and clogging during the production of biodiesel by biodiesel technology (SRCA technology). The treatment method is to carry out fouling treatment, which can increase the operation cycle of the heat exchanger, and has the advantages of simplicity, high efficiency and low cost

Method used

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  • Treatment method for heat exchanger fouling during biodiesel production process, and preparation method for biodiesel
  • Treatment method for heat exchanger fouling during biodiesel production process, and preparation method for biodiesel

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preparation example Construction

[0025] The present invention also provides a kind of preparation method of biodiesel, the method comprises the following steps:

[0026] (1) under transesterification reaction conditions, oil and methanol are contacted to obtain the crude biodiesel product;

[0027] (2) distilling the crude biodiesel product under the condition that methanol is distilled out to obtain methanol and the crude biodiesel product through distillation;

[0028] (3) After the distilled biodiesel crude product is washed with water and light components are removed, it is sent to the flash tower with a heat exchanger on the upper part for flash evaporation, and the component steam of biodiesel passes through the flash tower After the heat exchanger inside is cooled, it is discharged from the upper part of the flash tower into the biodiesel collection tank, and the heavy components with a boiling point higher than the biodiesel are extracted from the bottom of the flash tower;

[0029] (4) When the heat...

Embodiment approach

[0046] According to the preparation method of biodiesel of the present invention, wherein, a kind of preferred embodiment comprises the following steps:

[0047] 1) Under transesterification reaction conditions, the oil and methanol are contacted to obtain a crude biodiesel product, and the crude biodiesel product is distilled in a methanol distillation tower to remove most of the methanol to obtain a crude biodiesel product through distillation ;

[0048] 2) washing the distilled biodiesel crude product in a water washing tower, removing most of the glycerin and other low-carbon alcohols with water, and obtaining the washed biodiesel crude product;

[0049] 3) Distilling the washed biodiesel crude product in a light component distiller to remove light components whose boiling point is lower than the boiling point of biodiesel;

[0050] 4) Send the crude biodiesel product after removing the light components with a boiling point lower than the boiling point of biodiesel into a...

Embodiment 1

[0058] In the high-pressure reactor, oil ester and methanol are added at a molar ratio of 9:1, and the crude biodiesel product is obtained after reacting at 260°C and 6.5MPa for 2 hours; the obtained crude biodiesel product is distilled in a methanol distillation tower , the distillation conditions include: pressure 20kPa, tower top temperature 64°C, tower bottom temperature 86°C to obtain the crude biodiesel product through distillation; wash the crude biodiesel product through distillation and the washing water with the above-mentioned temperature of 90°C from the water respectively The bottom and top of the tower are continuously sent to the above-mentioned water washing tower for countercurrent contact, wherein 0.25 volume of desalted water is used for washing relative to 1 volume of biodiesel crude product. The washing conditions include: washing temperature 90 ° C, pressure 0.2 MPa, biological The contact time between the crude diesel product and the washing water is 2 ho...

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Abstract

The present invention provides a treatment method for heat exchanger fouling during a biodiesel production process. The method comprises that: the inner wall of the heat exchange medium tube pass of the heat exchanger contacts methanol. The present invention further provides a preparation method for a biodiesel, wherein the method comprises adopting the treatment method for the heat exchanger fouling to carry out descaling on the heat exchanger. According to the present invention, the treatment method for the heat exchanger fouling is adopted to carry out descaling, such that the operation period of the heat exchanger can be increased, and advantages of simpleness, high efficiency and low cost are provided.

Description

technical field [0001] The invention relates to a treatment method for fouling of heat exchangers in a biodiesel production process and a method for preparing biodiesel. Background technique [0002] Raw materials for the production of biodiesel by transesterification (SRCA) include jatropha oil, cottonseed oil, rubber oil, acidified oil, gutter oil, waste food oil, etc., which have a wide range of sources, contain more water and impurities, and are produced at high temperatures (260°C The reaction mode of alcoholysis and transesterification under high pressure (6.0MPa-8.0MPa) at -280°C, the product components are complex, and some C in the product 10 -C 40 Esters are easy to carbonize under high temperature and high pressure conditions, forming a thick carbon deposit on the surface of the equipment, making the equipment fouling and aging, especially for some heat exchange equipment, once the heat exchange effect is lost, the device will not be able to maintain normal Prod...

Claims

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Application Information

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IPC IPC(8): C11C3/10C10L1/02F28G9/00
CPCY02E50/13Y02E50/10
Inventor 郑长波刘强王先国史国强张庆英张军涛
Owner CHINA NAT OFFSHORE OIL CORP
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