Plant oil waste white clay recovery technology

Abstract

The invention discloses a plant oil waste white clay recovery technology for increasing the economic value of the waste white clay. The technology comprises the following steps: waste white clay grease extraction, solvent and grease recovery, grease pre-esterification, grease transesterification, ethyl ester / glycerin standing separation and ethyl ester purification. After extraction treatment, waste white clay and bean powder are mixed for being taken as a feed, waste processing amount and cost can be greatly reduced, and profit can be increased, grease in the waste white clay is low, spontaneous combustion hidden trouble is not generated; grease in the waste white clay is extracted, biodiesel with high value is generated through the esterification reaction, the conversion rate is higher than 85%, American biodiesel standard can be satisfied, and economic value for recovering grease can be greatly increased.

Description

[0001] technical field [0002] The invention relates to a recovery and reuse process of waste white clay produced in a vegetable oil refining and decolorization process. Background technique [0003] Waste white clay is the residual waste of the decolorization process in vegetable oil refining. The acidic activated clay added in the decolorization process varies depending on the manufacturing process, which is about 0.7~1.2% of the vegetable oil. According to experience, for every 1 ton of white clay added, about 1.2~1.4 tons of waste white clay will be produced, which contains about 20~40% of oil, phospholipids, saponified substances, pigments, trace elements and a little water. According to the statistics of the United States Department of Agriculture in 2006, the world produces 110 million tons of vegetable oil every year. If it is estimated with an average clay addition rate of 1%, about 800,000 to 1.3 million tons of activated clay will be used each year, and about 1 ...

AI Technical Summary

Problems solved by technology

However, due to the poor quality of the oil contained in it, it is not suitable for consumption and has low economic value, so most of it is not recycled, and because the waste clay contains oil, it is easy to spontaneously ignite at room temperature, causing troubles in waste disposal.

At present, the common waste clay treatment methods are: 1. As raw material for organic composting, however, due to the high fat content of waste clay, the composting time is longer; 2. The waste clay is passed through the air, and the grease in the waste clay is burned at high temperature. Finally, recycle the white clay that removes the grease, but the grease is not fully utilized, which is quite wasteful