2results about How to "Short retention time" patented technology

This invention provides a system for reverse heating of the pretreatment phase in an anaerobic fermentation apparatus, comprising a manure pretreatment unit, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit arranged sequentially; and a first heat recovery reverse heating unit and a second heat recovery reverse heating unit. One end of the first heat recovery reverse heating unit is connected to a boiler or generator, and the other end is connected to the primary anaerobic unit and the manure pretreatment unit, to utilize the heat from the boiler or generator for heating. One end of the second heat recovery reverse heating unit is connected to the tertiary anaerobic unit, and the other end is connected to the manure pretreatment unit, to utilize the heat from the materials in the tertiary anaerobic unit for heating. This invention utilizes the heat from the materials for reverse heating, which not only increases gas production but also raises the manure pretreatment temperature, thus better serving anaerobic fermentation.

The invention belongs to the technical field of chemical analysis and detection, and particularly relates to a method for distinguishing fatty alcohol-polyoxyethylene ether carboxylic acid prepared by an oxidation method and fatty alcohol-polyoxyethylene ether carboxylic acid prepared by a carboxymethylation method. According to the principle, the fatty alcohol-polyoxyethylene ether carboxylic acid product prepared by using two methods has different residual impurities, and the content of monochloroacetic acid and chloride ion impurities is determined by using an ion chromatography so as to identify the fatty alcohol-polyoxyethylene ether carboxylic acid product. The method is easy and convenient to operate, high in accuracy and precision and good in repeatability, and reliable technical support is provided for quality control and application and popularization of fatty alcohol-polyoxyethylene ether carboxylic acid products.