38 results about "Methyl acetylene" patented technology

The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetylene, methyl acetylene, propadiene, methane, hydrogen, carbon monoxide, carbon dioxide and C4+ components. In one embodiment, the initial effluent stream is provided from a methanol-to-olefin reaction system. It has been discovered that an efficient separation of these components is realized when DME is partially removed in a first separation step comprising methanol and water washing steps, followed by separation of the remaining components in additional separation steps.

A process for the production of organic acids having at least three carbon atoms comprises the steps of forming an amount of carbon monoxide and reacting the amount of carbon monoxide with an amount of an unsaturated hydrocarbon. The reaction is preferably carried out in the presence of a supported palladium catalyst, a strong acid, and a phosphine. In some embodiments, the unsaturated hydrocarbon is one of acetylene and methylacetylene, and the organic acid is one of acrylic acid and methyl acrylic acid. The reacting step is preferably performed with carbon monoxide produced from carbon dioxide.

The invention relates to a control method in the fields of chemical engineering and system engineering, in particular to an advanced control system for a rectification device in butadiene production. The technical solution of the present invention is: an advanced control method for a butadiene rectification device, the rectification device includes a first rectification tower and a second rectification tower, and the method includes the following steps: using a measuring instrument to obtain The real-time data of the measurement point of the first rectification tower; start the soft-sensing model, filter the real-time data and input it into the soft-sensing model, and measure the water content in the bottom of the first rectification tower; start the soft-sensing model, and filter the real-time data Input the soft sensor model to measure the methyl acetylene content at the top of the first rectification tower; according to the soft sensor model, the water content in the bottom of the first rectification tower and the methyl acetylene content at the top of the tower are calculated on the basis of DCS Real-time online closed-loop optimization control of product quality in the first distillation column.

The invention discloses preparation methods and applications for a terpyridine compound and a terpyridine metal complex. The preparation method for the terpyridine compound comprises the following steps: subjecting carbazole, bromohexane and a sodium hydroxide aqueous solution with the concentration of 50% to a substitution reaction in a DMSO solvent system at 50 DEG C; subjecting a compound 1 andNBS to a regioselective bromination reaction in a dichloromethane solvent system at 25 DEG C; subjecting bromobenzaldehyde, trimethylsilylacetylene, cuprous iodide and (beta-4)-platinum to a Sonogashira coupling reaction in a nitrogen gas environment and a dry diisopropylamine solution system at 80 DEG C; subjecting a compound 2, a compound 3, cuprous iodide and (beta-4)-platinum to a Sonogashiracoupling reaction in a nitrogen gas environment and a dry diisopropylamine and tetrahydrofuran solution system; and subjecting an alkyne-containing compound 4, diacylpyridine and potassium hydroxideto a Krohnke intermediate cyclization process reaction in an ethanol solvent system at 25 DEG C. The preparation method for the terpyridine compound provided by the invention has simple synthetic steps and mild conditions, and realizes multi-color printing and encrypted printing under visible sunlight.

The invention relates to a polypyrazole containing a xanthene structure and a preparation method thereof, specifically: three diyne monomers containing a xanthene structure 9,9-di(4-ethynylphenyl)xanthene, 9 ,9-bis(3-methyl-4-ethynylphenyl)xanthene and 9,9-bis(4-propargyloxyphenyl)xanthene, respectively with terephthaloyl dichloride and hydrazine hydrate or Phenylhydrazine undergoes "multi-component series" polymerization reaction, and a new type of polypyrazole containing xanthene structure is prepared. The functional polypyrazole of the present invention has good performances such as heat resistance, light transmission, dissolution and film formation due to the introduction of bulky xanthene structural groups into its main molecular chain, and has potential application prospects.

A selective hydrogenation method is particularly effective in selectively hydrogenating alkynyl compounds, such as acetylene or methyl acetylene, over alkenyl compounds, such as ethylene. The method produces a relatively high quantity of heat during the selective hydrogenation reaction. This production of heat is, however, quite beneficial in that enough heat is produced such that a substantial portion of the produced heat can be recovered for heat efficiency purposes.