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Recycling process for alkali refining by-product, namely soapstock in refining vegetable oil and reactor

A vegetable oil and by-product technology, applied in the petroleum industry, recycling technology, biofuels, etc., can solve the problems of secondary pollution, the unwillingness of large oil processing plants to process soapstock, and the inability of acidified oil to be used efficiently, so as to prevent secondary pollution. The effect of pollution, reducing alkaline wastewater discharge and improving raw material utilization efficiency

Inactive Publication Date: 2013-11-27
广州市南洋国际工程技术服务公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the acidified oil process has a lot of acidic wastewater, secondary pollution is likely to occur, and the obtained acidified oil cannot be used efficiently, so large oil processing factories are unwilling to process soapstock by themselves

Method used

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  • Recycling process for alkali refining by-product, namely soapstock in refining vegetable oil and reactor
  • Recycling process for alkali refining by-product, namely soapstock in refining vegetable oil and reactor
  • Recycling process for alkali refining by-product, namely soapstock in refining vegetable oil and reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Preparation of biodiesel from soybean oil soapstock:

[0073] ①Acidification of soybean oil soapstock: Take 200g of soap obtained from the centrifuge in the refining workshop and add it to the reaction kettle, add 30g of 98% sulfuric acid, add 30g of hot water, wait until the temperature rises to 60°C, and react for 3 hours to obtain 83g of acidified oil in the upper layer. Lower layer acid water 172g;

[0074] 2. Esterification of acidified oil: get step ① acidified oil 80g (acid value 151.35mgKOH / g) and add in the reactor, add granular sodium hydroxide catalyst 0.16g, add 24g crude glycerin (glycerol mass content is 50%), react The kettle was evacuated to a pressure of 9000 Pa, while stirring continuously, and the timing was started when the temperature reached 200°C. After 2 hours of esterification reaction, the esterified oleic acid value was measured to be 0.48 mgKOH / g;

[0075] ③Alcoholysis of esterified oil: Add methanol solution (containing 0.2g KOH and 16g...

Embodiment 2

[0082] (1) Preparation of biodiesel from soybean oil soapstock:

[0083] ①Acidification of soybean oil soapstock: Take 200g of the soap obtained from the centrifuge in the refining workshop and add it to the reaction kettle, add 60g of 50% sulfuric acid, wait until the temperature rises to 150°C, and react for 0.5h to obtain 82g of acidified oil in the upper layer and 172g of acidic water in the lower layer ;

[0084] 2. Esterification of acidified oil: get step ① acidified oil 80g (acid value 152.57mgKOH / g) and add in the reactor, add granular potassium hydroxide catalyst 0.64g, add 48g crude glycerin (glycerol mass content is 90%), react The kettle was evacuated to a pressure of 10000Pa while stirring continuously. The temperature of the cooling water in the condenser was 60°C. When the temperature reached 230°C, the timing was started. After 4 hours of esterification reaction, the acid value of the esterified oleic acid was measured to be 1.30 mgKOH / g;

[0085] ③Alcoholys...

Embodiment 3

[0088] (1) Preparation of biodiesel from rapeseed oil soapstock:

[0089] ①Acidification of rapeseed oil soapstock: Take 200g of soap obtained from the centrifuge in the refining workshop and put it into the reaction kettle, add 40g of 85% phosphoric acid, wait until the temperature rises to 90°C, and react for 3 hours to obtain 80g of acidified oil in the upper layer and 178g of acidic water in the lower layer ;

[0090] 2. Esterification of acidified oil: Take step 1. Add 80 g of acidified oil (acid value 168.61 mgKOH / g) into the reactor, add 0.4 g of granular potassium hydroxide catalyst, add 16 g of crude glycerin (glycerol mass content is 70%), and react The kettle was evacuated to a pressure of 2000Pa while stirring continuously. The temperature of the cooling water in the condenser was 30°C. When the temperature reached 170°C, the timer was started. After 2 hours of esterification reaction, the acid value of the esterified oleic acid was measured to be 0.26 mgKOH / g;

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Abstract

The invention discloses a recycling process for an alkali refining by-product, namely soapstock in refining vegetable oil and a reactor. The recycling process comprises the following steps: (1) acidizing the soapstock; (2), preparing a biodiesel through the acid oil; (3) neutralizing wastewater. According to the invention, a renewable energy source, namely the biodiesel is produced by directly acidizing the by-product, namely the soapstock produced in the vegetable oil refining process. Compared with the method of directly selling the soapstock, the recycling process has the advantages as follow: the problem that light diesel is needed to be purchased from the outside to be used as a fuel for the burning of a high-pressure steam generator in the deodorization working section of the same process is solved; secondary pollution after waste soapstock is sold is prevented; meanwhile, duo to acidified water after the soapstock is acidized, the discharge of high-alkalinity final washing water in the alkali refining working section is avoided; raw materials and water treatment cost are reduced. Therefore, the recycling process is an environment-friendly technology, and can bring more social and economic benefits.

Description

technical field [0001] The invention belongs to the field of resource recycling of soapstock, a by-product of alkali refining in vegetable oil refining, and the field of biodiesel preparation, and specifically relates to a process and a reactor for recycling soapstock, a by-product of alkali refining of vegetable oil refining. Background technique [0002] Biodiesel refers to fatty acid monoester (usually fatty acid methyl or ethyl ester) formed by conversion of animal oil, vegetable oil, waste oil or microbial oil. Biodiesel has the advantages of renewable, biodegradable, low combustion emissions and environmental friendliness. It is one of the ideal fuels to replace petrochemical diesel. Therefore, it has attracted much attention and has been extensively studied in recent years. [0003] Insufficient raw material oil has always been the biggest bottleneck restricting the development of global biodiesel, especially in my country. Our country has a lot of people and little ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C3/06C11C3/10C11B13/02C10L1/02C02F1/66
CPCY02E50/13Y02E50/10Y02W10/37Y02W30/74
Inventor 俞正平胡昊俞心建
Owner 广州市南洋国际工程技术服务公司
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