摘要:
In crystallizing .alpha.-APM from a water solution or a mixed solvent solution of water and a lower alcohol in a crystallizer, the pressure in the crystallizer is held at not higher than atmospheric pressure, a water or water/alcohol mixed solution of .alpha.-APM is fed into the crystallizer with stirring so that the solvent is vaporized, and the crystallization solution is cooled and crystallized by the latent heat of vaporization or is heated so as to prevent supercooling.
摘要:
A method of preparing .varies.-L-aspartyl-L-phenylalanine methyl ester hydrochloride (.varies.-APM.HCL) from a reaction mixture of N-formyl-L-aspartic acid anhydride and L-phenylalanine methyl ester (PM), wherein .alpha.-APM.HCl is produced without isolating an intermediate by solid-liquid separation during the course of the reaction process.
摘要:
A process for crystallizing L-alpha-aspartyl-L-phenylalanine methyl ester from its aqueous solution by cooling, which comprises adjusting the initial concentration of the ester so that the amount of a precipitated solid phase to be formed after cooling becomes about 10 grams or more per liter of the solvent, cooling the solution through conductive heat transfer through a cooled surface to form an apparently sherbet-like pseudosolid phase without causing forced flow by mechanical stirring or the like, and optionally further cooling the system after formation of the pseudosolid phase, is disclosed along with various apparatuses which may be used to carry out the invention.
摘要:
In a coating method, a coating section is arranged immediately before a coil bar while a smoother is disposed immediately after the coil bar, immediately after a coating solution is applied to a web which is run continuously a surplus of coating solution is scraped off and the web is subjected to smoothing by the smoother directly without undergoing a gaseous phase.
摘要:
A suspension apparatus for a vehicle having left and right wheels and comprising a pair of left and right trailing arms connected to a respective wheel, and a pair of laterally extending left and right rotary shafts connected to respective arms. The outer ends of the shafts are supported in bearings on the vehicle to permit individual rotation of the shafts and corresponding rocking of the arms and a tubular coupling interconnects the rotary shafts at the inner ends thereof also to permit individual rotation of the shafts. The suspension apparatus can be of semi-trailing type in which case the rotary shafts have bends therein and their inner ends rotate in the coupling about axes which are inclined with respect to the axes of rotation of the shafts in the bearings.
摘要:
A method of coating liquid coating compositions on a moving continuous web comprising roughening only the surface of a portion of the smooth web surface onto which coating is started. The method of this invention avoids the production of a thick coating to thereby prevent contamination in the steps and the process and requires no excess increase in drying, and the method is especially advantageous in the manufacture of photographic films, photographic papers, magnetic recording tapes, adhesive tapes, pressure sensitive recording papers, offset printing papers, etc.