52results about How to "Shorten the reaction time of esterification" patented technology

The improved continuous esterification process of waste animal and vegetable oil and grease with low carbon alcohol to prepare biodiesel oil features that liquid low carbon alcohol is introduced into the liquid comprising liquid waste animal and vegetable oil and grease in 95-99.9 wt% and acid catalyst in 0.1-5 wt% to produce esterification reaction at normal pressure and the temperature from vaporizing temperature to 95 deg.c while the vapor mixture comprising the resultant, water vapor and low carbon alcohol vapor is discharged from the top of the reactor and separated in a fractionating tower to obtain product, separated water and liquid low carbon alcohol for reuse. The process has high reaction speed, high reaction conversion rate and other advantages, and the product has acid value capable of being controlled below 2 mgKOH / g.

The invention relates to a green process for preparing sterol fatty acid ester. Use phytosterols, fatty acids or / and fatty acid esters, and antioxidants as raw materials. After mixing the raw materials evenly, heat and melt in vacuum or microwave radiation. After the above mixture is melted, add a catalyst. The amount of the catalyst added is 1% of the total weight of the reactants. 0.2% to 8%, after further thorough mixing, the esterification reaction is carried out for 3-20 hours at a temperature of 30-150 ° C, normal pressure or vacuum heating conditions of 10-100 Pa, or the esterification reaction is carried out by microwave radiation for 5-20 hours. For 30 minutes, the heating intensity of microwave radiation is 20W / mL~200W / mL, and the product after esterification reaction is separated, purified, and dried to obtain the sterol fatty acid ester product. Not only can the processing and reaction time be significantly shortened, the separation and purification steps can be simplified, the production efficiency can be improved, energy consumption can be saved, and the product has high biological activity and strong safety.

The invention discloses a method for preparing biodiesel from microalgae. The method comprises steps as follows: a culture medium is inoculated with haematococcus pluvialis, the haematococcus pluvialis is irradiated with a red and blue LED light-compensating lamp for 8-10 h every day and cultured at 23-25 DEG C for 7-8 d, and haematococcus pluvialis cells can be collected; the collected haematococcus pluvialis cells are subjected to wall breaking treatment with ultrasonic waves, extraction is performed with an organic solvent, microalgae oil is obtained, the microalgae oil, methanol and a zeolite molecular sieve catalyst are added to a reactor in the weight ratio being 1:(3-5):(0.01-0.03) for an esterification reaction, an esterification product is obtained, separated and purified, and the biodiesel can be obtained. According to the method, the haematococcus pluvialis which is short in production cycle, wide in application range, high in photosynthesis and high in oil content is taken as a raw material, and the problem of vegetable oil raw materials in the biodiesel development process is solved. Meanwhile, the method has the advantages that the preparation process is simple, the catalytic efficiency is high, the oil extraction rate is high, the product yield is high and the like, and a good foundation is laid for industrialization and mass production of biodiesel.

The invention provides a preparation method of an NTAA modified cellulose membrane and an application of NTAA in adsorption of methylene blue. A DMAc / LiCl system commonly used in preparation of a cellulose membrane is directly used as a solvent of NTAA modified cellulose, an intermediate complex step of purifying modified cellulose is omits, the esterification time of cellulose and NTAA is shortened by 1 / 2, and the esterification rate is improved. The 12 h adsorption rate of the prepared modified cellulose membrane to adsorb a methylene blue solution with the pH of 6 reaches 85% or more, and the adsorbing capacity is not significantly reduced after multiple times of adsorption and desorption.