The present invention provides a method for fixing carbon dioxide gas as a carbonyl compound represented by formula (3) as depicted by FIG. 1 and comprising, purging of carbon dioxide in a solution of a nucleophile represented by the formula (1) in presence of a solvent at a temperature ranging from 40 Degree Celsius to 35 Degree Celsius, followed by adding a reagent at temperature ranging from 40 degree to 35 degree and thereafter adding another nucleophile represented by the formula (2) to obtain carbonyl compound represented by formula (3). The present invention can be advantageously used to obtain commercially important carbonyl compounds and clean unwanted carbon dioxide gas from the atmosphere and industrial effluents.

##STR00001##

Monoisocyanate impurities are removed from a process stream obtained when solvent is separated from a polyisocyanate product. The monoisocyanates are reacted with amine compounds at specific molar ratios to produce ureas. The ureas can be discarded by burning, landfilling or otherwise. Alternatively the ureas can be recycled back into the polyisocyanate manufacturing process, where they are formed into biuret compounds that can remain with the polyisocyanate product.

Monoisocyanate impurities are removed from a process stream obtained when solvent is separated from a polyisocyanate product. The monoisocyanates are reacted with amine compounds at specific molar ratios to produce ureas. The ureas can be discarded by burning, landfilling or otherwise. Alternatively the ureas can be recycled back into the polyisocyanate manufacturing process, where they are formed into biuret compounds that can remain with the polyisocyanate product.

Organic isocyanates are converted to ureas by heating in the presence of certain cobalt, magnesium, chromium and lanthanide series organometallic catalysts. The process requires no water or other reactants. The process is particularly useful for removing small quantities of monoisocyanates from a solvent stream recovered from a polyisocyanate manufacturing process. The urea compounds in some instances can be recycled back into the polyisocyanate manufacturing process and reacted with polyisocyanate compounds to form biurets.

Organic isocyanates are converted to ureas by heating in the presence of certain cobalt, magnesium, chromium and lanthanide series organometallic catalysts. The process requires no water or other reactants. The process is particularly useful for removing small quantities of monoisocyanates from a solvent stream recovered from a polyisocyanate manufacturing process. The urea compounds in some instances can be recycled back into the polyisocyanate manufacturing process and reacted with polyisocyanate compounds to form biurets.

A compound of formula (I) or pharmaceutically acceptable salts or hydrates thereof:

##STR00001## wherein R is chosen from phenyl, a 6-membered heteroaryl group, cyclohexyl, a 5-membered heteroaryl group; a bicyclo [3.1.0] hexanyl group; a C.sub.2-C.sub.5 alkynyl group; and a cubanyl group; wherein R1 and R2, independently, are chosen from H; C.sub.1-C.sub.6 alkyl (optionally substituted with one or more halogens); C.sub.1-C.sub.6 alkyl-S(O).sub.n; CO.sub.2H (or C.sub.1-C.sub.6 alkyl esters thereof or C.sub.1-C.sub.6 alkyl amides thereof); halogen; C.sub.1-C.sub.6 alkoxy; CN; NO.sub.2; and NR.sub.7R.sub.8; wherein R.sub.7 and R.sub.8, independently, each represent H, C.sub.1-C.sub.6 alkyl, C.sub.1-C.sub.6 alkylcarbonyl, C.sub.1-C.sub.6 alkoxycarbonyl, arylsulphonyl, heteroarylsulphonyl, heterocyclosulphonyl, arylcarbonyl, heteroarylcarbonyl, heterocyclocarbonyl, or C.sub.1-C.sub.6 alkylsulphonyl, or R.sub.7, R.sub.8 and the nitrogen to which they are attached form a 5 or 6 membered heterocyclic ring (such as morpholine or piperidine); and wherein n represents 0-2.

A thixotropic agent for increasing the yield point of a curable composition, wherein the thixotropic agent includes (i) at least one urea compound from the reaction of at least one isocyanate with at least one amine and (ii) at least one polyether having blocked hydroxyl groups. The thixotropic agent is preparable in a simple manner and forms a spreadable paste which is firm at room temperature. It is particularly suitable as a constituent of moisture-curing polyurethane or SMP compositions, giving a good increase in the yield point thereof, without adversely affecting storage stability or migration characteristics. It enables phthalate-free adhesives, sealants or coatings that have surprisingly good conveyability coupled with a high yield point, and do not cause any problems with odor or fogging.