71 results about "Di-n-butylamine" patented technology

The invention discloses a preparation method for sulfur-containing carbofuran derivative with less than 0.1% of harmful impurity carbofuran. The preparation method comprises the following steps of: using di-n-butylamine or N-isopropyl-beta-alanine ethyl ester derivative and sulfur monochloride as raw materials to prepare into disulphide in the presence of an acid-binding agent triethylamine and an organic solvent 1, 2-dichloroethane; and then reacting with a chlorinating agent sulfuryl chloride to obtain nitrogen sulfur chlorine; and finally reacting with carbofuran under the effect of a cosolvent N-methyl-2-pyrrolidone or dimethylformamide so as to obtain the sulfur-containing carbofuran derivative with not less than 96% of quality percentage composition and less than 0.1% of main harmful impurity carbofuran. By adopting the preparation method, the problem that the carbofuran cannot be completely reacted during being reacted can be solved, the defects due to low content and low yield of sulfur-containing carbofuran derivatives such as benfuracarb and carbosulfan caused by a solid-liquid two-phase reaction can be avoided, the technical problem due to relatively high content of main harmful impurity carbofuran can be solved, and the content of the sulfur-containing carbofuran derivatives such as benfuracarb and carbosulfan can reach a value not less than 96%, and the yield is 97 to 98%, and the main harmful carbofuran in the product is less than or equal to 0.1%, so that the preparation method has a wide popularization and application prospect.

The invention discloses a method for synthesizing a heteroatom substituted MeAPO-31 molecular sieve by microwave heating, relating to a preparation method of a MeAPO-31 molecular sieve. The invention aims to solve the technical problems that the traditional method for preparing the MeAPO-31 molecular sieve has long crystallization time, easy generation of mixed crystals in products, limited type and quantity of the heteroatom introduced into a frameworkd, the narrow adjustable range of the produced acid sites and the like. The method comprises the following steps of: firstly, preparing gel byusing phosphoric acid, water, di-n-butylamine, aluminum isopropoxide (or boehmite) and metal salt; heating with microwaves; and crystallizing, then centrifugally filtering, washing, drying and roasting to obtain the MeAPO-31 molecular sieve. Compared with the traditional hydrothermal process, the method disclosed in the invention obviously shortens the crystallization time of the molecular sieve and does not generate mixed crystals. The MeAPO-31 molecular sieve prepared with the method can be used as catalysts in the fields of petrochemical industry, fine chemical industry and the like.

A poly(2,6-dimethyl-1,4-phenylene ether) prepared using a morpholine-containing polymerization catalyst has a monomodal molecular weight distribution with a reduced content of very high molecular weight species. It also exhibits increased morpholine incorporation in the high molecular weight fraction. Compared to commercially available poly(2,6-dimethyl-1,4-phenylene ether) prepared using a di-n-butylamine-containing polymerization catalyst, the poly(2,6-dimethyl-1,4-phenylene ether) of the invention exhibits reduced odor. Compared to other poly(2,6-dimethyl-1,4-phenylene ether) prepared using a morpholine-containing polymerization catalyst, the poly(2,6-dimethyl-1,4-phenylene ether) of the invention exhibits improved molecular weight build during compounding and improved compatibilization with polyamides.