Method for removing methanol from crude methyl ester
A technology for removing methanol and crude methyl ester, applied in the field of biodiesel, can solve the problems of difficult evaporation, high consumption of raw materials, and difficulty in removing methanol, and achieve the effects of improving purity, improving product quality, and appropriately controlling temperature.
Inactive Publication Date: 2015-03-11
宁波杰森绿色能源科技有限公司
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[0002] Biodiesel is a fatty acid monoalkyl ester obtained by transesterification of animal and vegetable oils and alcohols (such as methanol or ethanol), the most typical is fatty acid methyl ester, biodiesel is an excellent supplement and substitute for petrochemical diesel, biodiesel During the refining process of diesel oil, there are many impurities, such as glycerin, methanol, low boiling substances, etc., resulting in low product purity, poor product quality, high raw material consumption, and when the methanol content in the crude methyl ester is low, it is difficult to evaporate. Under limited conditions, it is very difficult to demethanolize crude methyl esters, with large investment, poor effect and complicated process
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[0015] A method for demethanolization of crude methyl esters, using a negative pressure method to control the pressure in the superficial multi-layer still 1 to 2000-5000Pa, under the action of negative pressure, the crude methyl esters are sprayed from the feed port 3 to the shallow In the surface multi-layer still 1, there are 5-8 layers of split layers 2 in the superficial multi-layer still 1. The crude methyl ester is subjected to heat exchange treatment, and the heat exchange temperature is controlled below 125°C. In layer 2, the methanol is evaporated through shallow evaporation layer by layer, and then the methanol is extracted from the outlet 4 at the upper end of the superficial multi-layer evaporator 1 with a vacuum pump. Use refrigerated methanol liquid as liquid ring vacuum pump replenishment liquid, cool the extracted methanol to below 25°C, recycle, remove the crude methyl ester from methanol, collect from outlet 5 at the lower end of superficial multi-layer still...
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The invention relates to a method for removing methanol from crude methyl ester. By a negative pressure method, crude methyl ester is transferred to a superficial multilayer distiller. Through heat exchange treatment, methanol is evaporated. Then, methanol is pumped through a vacuum pump, and methanol is cooled by a freezing method and recycled. The crude methyl ester which gets rid of methanol is connected from an outlet at the lower end of the superficial multilayer distiller. The technology provided by the invention is simple. By the negative pressure method, the crude methyl ester can rapidly and effectively be transferred to the superficial multilayer distiller so as to raise work efficiency. By heat exchange treatment, methanol is evaporated rapidly. The temperature is controlled appropriately so as to prevent a reaction between ester and alcohol and raise product quality. In addition, by the use of the vacuum pump to pump methanol timely, methanol is recycled, and purity of the product is improved greatly. Moreover, due to the arrangement of multiple distributary layers in the superficial multilayer distiller, contact area can be increased during the heat exchange, and methanol removal efficiency is enhanced. The method provided by the invention meets actual requirements of the market and is suitable for large-scale popularization.
Description
technical field [0001] The invention relates to the technical field of biodiesel, in particular to a method for demethanolizing crude methyl esters. Background technique [0002] Biodiesel is a fatty acid monoalkyl ester obtained by transesterification of animal and vegetable oils and alcohols (such as methanol or ethanol), the most typical is fatty acid methyl ester, biodiesel is an excellent supplement and substitute for petrochemical diesel, biodiesel During the refining process of diesel oil, there are many impurities, such as glycerin, methanol, low boiling substances, etc., resulting in low product purity, poor product quality, high raw material consumption, and when the methanol content in the crude methyl ester is low, it is difficult to evaporate. Under limited conditions, it is very difficult to demethanolize crude methyl esters, and the investment is large, the effect is poor, and the process is complicated. Contents of the invention [0003] The purpose of the...
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Login to View More IPC IPC(8): C11C1/10
CPCC11C1/10
Inventor 邬仕平
Owner 宁波杰森绿色能源科技有限公司