The invention adopts graphite distillation; the daily output per set of production devices is up to several tons or even tens of tons; the pollution source control is easy, and the generation of dilute acid is eliminated.CN肖启发肖克强
(1) The preparation process of PDA-GO is as follows: Weigh a specific amount of Tris powder (Macklin Biochemical Co., Ltd)and dissolve it in triple-distilled water to prepare a 10 mM solution. Adjust the solution’s pH to 8.5 using dilute hydrochloric acid (HCl) (Aladdin Reagent Co...
Composite porous foam NiZn alloy electrodes with nano pore structure were prepared by the combination of eletrodeposition, heat treatment and HCl etching. The morphology of the electrodes was examined by scanning electron microscopy (SEM). And the compon
(VI) onto HCF and CF were investigated as a function of the solution pH, contact time, initial U concentration and temperature by batch adsorption experiments. The solution pH was adjusted by adding NaOH and HCl and measured using a glass electrode (Leici PHS-3C, China). HCF or CF was ...
Four rework procedures were developed to reduce the level of MeCl in one batch of HCl salt. Generating the salts at a lower temperature (10 °C) was the key parameter to minimize the concentration of these impurities in this drug candidate when HCl was charged as 37% aqueous HCl. Control...
The starch suspensions were neutralized with dilute HCl (0.1 mol/L). The slurry was centrifuged for 15 min at 10,000 g. The starch cakes obtained were washed with distilled water until its sulphate content was negative with BaCl2. The hydroxypropylated starches were dried in the oven to ˜...
6-dinitro-1,3-benzenediol is catalytically hydrogenated in dilute hydrochloric acid to produce the 4,6-diamino-1,3-benzenediol. See Wolfe et al., Macromolecules, 14. p. 909 (1981). This process is disadvantageous in that it requires extensive purification and utilizes expensive starting ...
The extract is washed free from N-methylmorpholine with dilute sulfuric acid and water and, after drying over anhydrous sodium sulfate, is concentrated in a vacuum. 18.13 g threo-5-(2-chlorophenylhydroxymethyl)-4-methoxy-2(5H)-furanone crystallize out. Evaporation of the filtrate and ...
(24:1) is not critical, for reasons of practicality higher ratios, which would produce extremely dilute reaction solutions (and likely require larger amounts of hydrogen halide) and thereby make isolation of the 2-haloaldehyde acetal product more tedious and time-consuming, are not generally ...
of 4-amino-2,2-difluorobenzo-1,3-dioxole, subsequent reaction with acrylonitrile in the presence of CuCl and HCl elimination from the resulting 4-(2-chloro-2-cyano-eth-1-yl)-2,2-difluorobenzo-1,3-dioxole. (2,2-Difluorobenzo-1,3-dioxol-4-yl)-methyl esters of pyrethroid or ...