摘要:
There are provided a method for analyzing an aqueous ammonium carbamate solution whereby the composition of an unreacted-gas absorber outlet liquid can be specified in real time, and a method for operating an unreacted gas absorber by use of the same. The method for analyzing the composition of an aqueous ammonium carbamate solution includes determining ammonia component concentration, carbon dioxide component concentration, and water concentration of the aqueous ammonium carbamate solution, which is the unreacted-gas absorber outlet liquid in a urea production process, by using a correlation among viscosity, temperature, and carbon dioxide component concentration of the aqueous solution and a correlation among density, temperature, ammonia component concentration, and carbon dioxide component concentration of the aqueous solution, wherein the ammonia component concentration is a concentration of a sum of free ammonia and equivalent ammonia of ammonium carbamate which are contained in the aqueous solution, and the carbon dioxide component concentration is a concentration of equivalent carbon dioxide of ammonium carbamate contained in the aqueous solution.
摘要:
Disclosed is an organosiloxane composition which can be produced at low cost and is usable for bonding of glasses, metals and resins. The organosiloxane composition can provide a cured product exhibiting excellent heat resistance and cold resistance, while having high strength and high transparency. Specifically disclosed is a polyorganosiloxane composition containing (A) a polyorganosiloxane wherein at least one end of each molecule is modified with a silanol group, and (B) 0.5-4.0 moles of a metal alkoxide per 1 mole of the polyorganosiloxane, wherein the mean molecular weight (Mw) of the polyorganosiloxane according to the mass fraction is not more than 1,000. Also specifically disclosed are a cured product of the composition and a method for producing the composition.
摘要:
Disclosed are: a polyorganosiloxane composition which can be cured into a product having high strength and has little influence on the environment; and a cured product of the polyorganosiloxane composition. Specifically disclosed are: a polyorganosiloxane composition comprising (A) a polyorganosiloxane in which at least one end in the molecule is modified with a silanol, (B) a titanium alkoxide in an amount of 0.01 to 2 moles relative to 1 mole of the polyorganosiloxane, and (C) an α-hydroxycarbonyl compound or a hydroxycarboxylic acid ester in an amount of 0.01 to 2 moles relative to 1 mole of the polyorganosiloxane; and a cured product of the polyorganosiloxane composition.
摘要:
Disclosed are: a polyorganosiloxane composition which can be cured into a product having high strength and has little influence on the environment; and a cured product of the polyorganosiloxane composition. Specifically disclosed are: a polyorganosiloxane composition comprising (A) a polyorganosiloxane in which at least one end in the molecule is modified with a silanol, (B) a titanium alkoxide in an amount of 0.01 to 2 moles relative to 1 mole of the polyorganosiloxane, and (C) an α-hydroxycarbonyl compound or a hydroxycarboxylic acid ester in an amount of 0.01 to 2 moles relative to 1 mole of the polyorganosiloxane; and a cured product of the polyorganosiloxane composition.
摘要:
There are provided a method for analyzing an aqueous ammonium carbamate solution whereby the composition of an unreacted-gas absorber outlet liquid can be specified in real time, and a method for operating an unreacted gas absorber by use of the same. The method for analyzing the composition of an aqueous ammonium carbamate solution includes determining ammonia component concentration, carbon dioxide component concentration, and water concentration of the aqueous ammonium carbamate solution, which is the unreacted-gas absorber outlet liquid in a urea production process, by using a correlation among viscosity, temperature, and carbon dioxide component concentration of the aqueous solution and a correlation among density, temperature, ammonia component concentration, and carbon dioxide component concentration of the aqueous solution, wherein the ammonia component concentration is a concentration of a sum of free ammonia and equivalent ammonia of ammonium carbamate which are contained in the aqueous solution, and the carbon dioxide component concentration is a concentration of equivalent carbon dioxide of ammonium carbamate contained in the aqueous solution.