A process for producing ethylene glycol and/or ethylene carbonate, said process comprising contacting at least a portion of a recycle gas stream comprising an alkyl iodide impurity with a guard bed system positioned upstream of an ethylene oxide reactor to produce a treated recycle gas stream, wherein the guard bed system comprises silver on alumina; contacting an epoxidation feed stream comprising an ethylene feed stream, oxygen, chloride moderator, and at least a portion of the treated recycle gas stream with an epoxidation catalyst in the ethylene oxide reactor to produce an epoxidation reaction product comprising ethylene oxide; and contacting at least a portion of the epoxidation reaction product comprising ethylene oxide with a liquid absorbent in the presence of an iodide-containing catalyst in an absorber to produce a product stream comprising ethylene carbonate and/or ethylene glycol and the recycle gas stream comprising the alkyl iodide impurity.

A process for preparing alkylene glycol from particulate matter comprising hemicellulose, cellulose and lignin, which process comprises the steps of subjecting a reactor comprising such particulate matter to a two-stage hydrolysis in the presence of hydrochloric acid to hydrolase the hemicellulose and cellulose in the particulate matter to saccharides, followed by subjecting the obtained hydrolysates to a catalytic conversion with hydrogen and in the presence of a catalyst system to a product comprising one or more alkylene glycols.

A process for preparing alkylene glycol from particulate matter comprising hemicellulose, cellulose and lignin, which process comprises the steps of subjecting a reactor comprising such particulate matter to a two-stage hydrolysis in the presence of hydrochloric acid to hydrolase the hemicellulose and cellulose in the particulate matter to saccharides, followed by subjecting the obtained hydrolysates to a catalytic conversion with hydrogen and in the presence of a catalyst system to a product comprising one or more alkylene glycols.

The present invention provides a process for recovering glycol from a process stream comprising glycol, water, dissolved salts, and hydrocarbons. The process comprises subjecting the process stream to a salt-enrichment process to obtain a salt-enriched stream having a salt concentration higher than salt concentration of the process stream, and a salt-reduced stream; subjecting the salt-enriched stream to a glycol reclaiming process to separate the salts and at least a portion of the hydrocarbons from the salt enriched stream to obtain a substantially salt-free water-glycol stream; and blending the salt reduced stream from the salt-enrichment process with the substantially salt-free stream to produce a reclaimed water-glycol stream

The present invention provides a process for recovering glycol from a process stream comprising glycol, water, dissolved salts, and hydrocarbons. The process comprises subjecting the process stream to a salt-enrichment process to obtain a salt-enriched stream having a salt concentration higher than salt concentration of the process stream, and a salt-reduced stream; subjecting the salt-enriched stream to a glycol reclaiming process to separate the salts and at least a portion of the hydrocarbons from the salt enriched stream to obtain a substantially salt-free water-glycol stream; and blending the salt reduced stream from the salt-enrichment process with the substantially salt-free stream to produce a reclaimed water-glycol stream

Being used for drug modification, the multi-arm single molecular weight polyethylene glycol active derivative provided herein can effectively improve the solubility, stability, and immunogenicity of the drugs, improve the absorption of the drugs in vivo, prolong the half-life of the drugs, and increase bioavailability, enhance efficacy, and reduce toxic and side effects of the drugs. A gel formed from the multi-arm single molecular weight polyethylene glycol active derivative provided herein can be used for the preparation of controlled release drugs so as to prolong the action time of the drugs, thereby reducing the number of administrations and improving patient compliance.

A process for the preparation of ethylene glycol comprising the steps of: a) supplying a first gas composition comprising ethylene oxide and carbon dioxide to an ethylene oxide absorber and allowing the gas composition to pass upwards through an absorption section; b) supplying a lean absorbent to the top of the absorption section and allowing the lean absorbent to pass downwards through the absorption section; c) intimately contacting the gas composition with lean absorbent on the trays in the absorption section in the presence of one or more catalysts to produce a fat absorbent stream comprising ethylene glycol and ethylene carbonate; d) withdrawing fat absorbent from the absorber; and e) withdrawing a second gas composition from the top of the absorber.

A process for the preparation of ethylene glycol comprising the steps of: a) supplying a first gas composition comprising ethylene oxide and carbon dioxide to an ethylene oxide absorber and allowing the gas composition to pass upwards through an absorption section; b) supplying a lean absorbent to the top of the absorption section and allowing the lean absorbent to pass downwards through the absorption section; c) intimately contacting the gas composition with lean absorbent on the trays in the absorption section in the presence of one or more catalysts to produce a fat absorbent stream comprising ethylene glycol and ethylene carbonate; d) withdrawing fat absorbent from the absorber; and e) withdrawing a second gas composition from the top of the absorber.

An improved process for the recovery of high-purity ethylene-oxide water feed streams to EO purification and MEG reaction units when both are operating in EO plants that incorporate EO Stripper bypass technology, by installing a second lights stripper to exclusively degasify the diluted EO feed to the MEG reactor, thus permitting the use of additional bypassed (gasified) EO absorbate as the diluent and resulting in a substantial increase in the total amount of EO absorbate that can bypass the EO Stripper.

An improved process for the recovery of high-purity ethylene-oxide water feed streams to EO purification and MEG reaction units when both are operating in EO plants that incorporate EO Stripper bypass technology, by installing a second lights stripper to exclusively degasify the diluted EO feed to the MEG reactor, thus permitting the use of additional bypassed (gasified) EO absorbate as the diluent and resulting in a substantial increase in the total amount of EO absorbate that can bypass the EO Stripper.