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1. 【Application (Patent) Number】 CN01107895.2 【Application Date】 2001.03.12 【Title】 A Method for Producing Biodiesel 【Publication (Announcement) Number】 CN1374370 【Publication (Announcement) Date】 2002.10.16 【Main Classification Number】 C10G3/00 【Classification Number】 C10G3/00 【Applicant (Patent Holder)] Lin Huachao 【Address】 No. 780–800, Jiahe Road, Huli District, Xiamen City, Fujian Province, 361009 【Inventor (Designer)] Lin Huachao 【Patent Agency】 Xiamen Chuangshou Junhe Patent Agency Co., Ltd. 【Agent】 Zhang Songting 【Abstract】 This invention provides a method for producing biodiesel. It uses acidified vegetable oil, sewage oil, and recycled frying oil as raw materials; after esterification, the methyl ester is distilled under vacuum. An appropriate amount of polymerization inhibitor is added during the distillation process to prevent further polymerization of the methyl ester, thereby increasing its yield. During the distillation process after the esterification reaction, the distillate is cooled to 0°C; after filtering out the precipitated substances, the resulting liquid is fuel methyl ester (i.e., biodiesel). The performance parameters of this biodiesel are similar to those of 0# diesel, making it suitable as a substitute for 0# diesel. This invention provides excellent environmental protection benefits. 【Claim】 Claim 1: A method for producing biodiesel, which uses esterified vegetable oils, sewage oil, and recycled frying oil as raw materials; after methylation, the methyl ester is distilled under vacuum to obtain biodiesel, characterized in that an anti-polymerization agent, boric acid, is added during vacuum distillation. Note: Unauthorized. 2. 【Application (Patent) Number】 CN02115477.5 【Application Date】 2002.01.25 【Title】 Process for Producing Biodiesel from Waste Animal and Plant Oils 【Publication (Announcement) Number】 CN1382762 【Publication (Announcement) Date】 2002.12.04 【Main Classification Number】 C10G3/00 【Classification Number】 C10G3/00 【Applicants (Patent Holders)] Ye Huodong; Ding Yitian 【Address】 Zhuoyue Chemical Co., Ltd., Xieyang Industrial Zone, Longyan City, Fujian Province, 364000 【Inventors (Designers)] Ye Huodong; Ding Yitian 【Abstract】 This invention relates to a process for producing biodiesel from waste animal and plant oils. It involves the alcoholysis and esterification of waste animal and plant oils with different acid values in the presence of an acidic catalyst ； Then, the excess components that are not part of the product are separated out to obtain the crude product ； Saturated brine containing 10% soda ash is added to the crude product to carry out a neutralization reaction, yielding a washed crude ester. Finally, industrial soda ash is added to this washed crude ester and heated for distillation; the fraction with a vapor temperature of 22–320°C is collected to obtain the finished biodiesel. This invention features a wide range of available raw materials, a simple production process, low costs, no pollution, and safe and reliable use. No wastewater is generated during its production process, meeting current domestic environmental protection requirements. Biodiesel produced using the process of this invention has been validated through pilot-scale tests, showing good performance and being fully capable of replacing mineral diesel. Replacing mineral diesel with vegetable and animal oils will make diesel production renewable and facilitate the industrialization of agriculture. 【Claim】 Claim 1. A process for producing biodiesel from waste animal and vegetable oils, characterized in that: in the presence of an acidic catalyst, alcohol catalysts are added to waste animal and vegetable oils with different acid values to carry out alcoholysis and esterification reactions, thereby obtaining a crude ester ； After allowing the synthesized crude ester to stand, the excess components that are not part of the product are separated, yielding the crude product ； To the crude product, saturated salt water containing 10% soda ash is added to carry out a neutralization reaction, resulting in a washed crude ester. Finally, this washed crude ester is subjected to heat distillation; the fraction with a vapor temperature of 220–320°C is collected to obtain the final biodiesel product. The process formula is as follows: (based on the weight of raw materials – waste animal and plant oils as 100%): Waste animal and plant oils – 100%; Alcoholic catalyst – 10–20%; Acidic catalyst – 0.7–1.1%; Alkali salts – 4–6%; Soda ash – 0.4–0.8%. Note: Unauthorized use prohibited. 3. 【Application (Patent) Number】 CN02138523.8 【Application Date】 2002.11.04 【Title】 Method for Producing Biodiesel from Waste Animal and Plant Oils with High Acid Value 【Publication (Announcement) Number】 CN1412278 【Publication (Announcement) Date】 2003.04.23 【Main Classification Number】 C10G3/00 【Classification Number】 C10G3/00 【Applicant (Patent Holder)] Song Tingli; Nanjing Chaotong Chemical Co., Ltd. 【Address】 No. 18, Gongnong Avenue, Changchun City, Jilin Province 130021 【Inventors (Designers)] Song Tingli; Zhu Xiangping 【Patent Agency】 Nanjing Tianyi Patent Agency Co., Ltd. 【Agent】 Tang Zhiwu 【Abstract】 This invention relates to a method for producing biodiesel – fatty acid methyl esters – from waste animal and plant oils with high acid value. It is characterized by the use of an acidic catalytic method, in which the oils react with low-carbon alcohols under the action of an acidic catalyst, through (1) dehydration ； (2) Esterification, transesterification ； (3) Phase separation ； (4) Four steps of decolorization are used to produce fatty acid methyl esters. The raw materials for this invention are readily available and its implementation is simple; it solves the problem of environmental pollution caused by high-acid-value waste animal and vegetable oils, which fail to be utilized fully and effectively, thereby providing a new approach for the utilization of such waste oils. The biodiesel produced has less exhaust pollution compared to petrochemical diesel, and it can effectively reduce the \"greenhouse effect\". 【Main Claim】 Claim 1: A method for producing biodiesel from waste animal and vegetable oils with a high acid value, characterized in that an acidic catalytic method is employed, wherein the oils react with low-carbon alcohols in the presence of an acidic catalyst, comprising the following steps: (1) Dehydration ； (2) Esterification, transesterification ； (3) Phase separation ； (4) Decolorization ； Note: Unauthorized. 4. 【Application (Patent) Number】 CN03119600.4 【Application Date】 2003.03.13 【Title】 A Method for Preparing Biodiesel 【Publication (Announcement) Number】 CN1436834 【Publication (Announcement) Date】 2003.08.20 【Main Classification Number】 C10G3/00 【Classification Number】 C10G3/00 【Applicant (Patent Holder)] Tsinghua University 【Address】 P.O. Box 100084-82, Beijing 100084, China 【Inventors】 Du Wei; Xu Yuanyuan; Liu Dehua 【Patent Agency】 Beijing Zhonghe Chengcheng Intellectual Property Agency Co., Ltd. 【Agent】 Li Guangsong 【Abstract】 This invention discloses a method for preparing biodiesel, which falls within the field of biofuel synthesis. Biodiesel is produced from renewable resources such as animal and plant oils, using bioenzymes as acyl acceptors at an appropriate temperature range. It has advantages such as mild reaction conditions, environmental friendliness, and a simple and easy-to-control reaction process ； Moreover, lipases reused multiple times can still maintain high catalytic activity. 【Claim】 1. A method for preparing biodiesel, characterized in that short-chain fatty acid esters are used as acyl acceptors, and biological enzymes are employed to catalyze the transesterification of animal and plant oils; the molar ratio of short-chain fatty acid esters to oils is 3:1 to 20:1. After a reaction period of 4 to 20 hours, biodiesel is produced. The production process consists of the following steps: 1) Heating in an automatically temperature-controlled reciprocating shaker to 20°C to 60°C℃ ； 2). The short-chain fatty acid esters and oils were placed into a stoppered Erlenmeyer flask in a molar ratio of 3:1 to 20:1 and mixed thoroughly ； 3). A lipase amounting to 30% of the fat mass is added to initiate the reaction, and after 4 to 20 hours of reaction, biodiesel can be produced. Note: Authorize and maintain. 5. 【Application (Patent) Number】 CN03114294.X 【Application Date】 2003.04.24 【Title】 Method for Producing Biodiesel via Biocatalytic Transesterification of Oils 【Publication (Announcement) Number】 CN1453332 【Publication (Announcement) Date】 2003.11.05 【Main Classification Number】 C10G3/00 【Classification Number】 C10G3/00 【Applicant (Patent Holder)] South China University of Technology 【Address】 No. 381, Wushan Road, Tianhe District, Guangzhou City, Guangdong Province, 510640 【Inventors】 Zong Minhua; Wu Hong 【Patent Agency】 Guangzhou Yuegao Patent Agency Co., Ltd. 【Agent】 Li Weidong 【Abstract】 This invention relates to a method for producing biodiesel through biocatalytic transesterification of oils. In this method, a 3–4 stage fixed-bed enzyme reactor is used for continuous transesterification reactions. The raw oil is first added to the first fixed-bed enzyme reactor, along with methanol; the molar ratio of alcohol to oil is 0.5–1:1. The effluent from the reaction is separated to obtain crude glycerol, while the remaining products pass through each subsequent enzyme reactor in turn. This process is repeated, and after completion of the reactions, the final products are separated to yield the finished biodiesel. Using inexpensive oils as raw materials, this invention enables waste utilization and reduces the production cost of biodiesel. Using lipase and microbial cells as catalysts, this invention simplifies the raw material processing and product recovery processes, reduces the reaction temperature, prevents the catalyst from contaminating the reaction byproduct glycerol, and results in no pollutant emissions. The product quality of this invention meets the international standards for biodiesel. 【Main Title】 1. A method for producing biodiesel through biocatalytic transesterification of fats and oils, characterized in that it comprises the following steps and process conditions: a continuous transesterification reaction is carried out using 3–4 stages of fixed-bed enzyme reactors. First, the raw oil and fat, which have been pre-treated to remove impurities, are fed into the first fixed-bed enzyme reactor; methanol is also added to this reactor, with a molar ratio of alcohol to oil of 0.5–1∶1. The effluent from the reaction is separated to obtain crude glycerol, while the remaining products pass through each subsequent enzyme reactor in turn. This process is repeated, and after the reaction is complete, the final product is separated to yield the finished biodiesel ； The temperature throughout the reaction process is 25–50°C. Note: Unauthorized. This post was last edited by synsj on 2008-1-27 23:12]