The present disclosure provides a method for purifying trifluoroiodomethane. The method includes providing a process stream comprising trifluoroiodomethane, organic impurities, and acid impurities; reacting the process stream with a basic aqueous solution, the basic aqueous solution comprising water and at least one base selected from the group of an alkali metal carbonate and an alkali metal hydroxide; and separating at least some of the organic impurities from the process stream.

Embodiments described herein provide a method, comprising reducing pH of a glycol vaporization separator purge stream to form an acid stream; distilling the acid stream to form an overhead stream and a bottoms stream; and recycling the bottoms stream to the vaporization separator.

The present invention relates to an intensification of the synthetic process for the preparation of dialkyl ether from alcohol by using a conical fixed bed reactor integrated with distillation coupled conical polishing reactor.

A method for purifying an N-(-alkoxyethyl)formamide contained in a mixture thereof with a plurality of distillation columns, the plurality of distillation columns being arranged serially, the method including condensing a distillate from the second or any later-stage distillation column to obtain a condensate and returning at least some of the condensate to the preceding distillation column.

Processes for the production of high purity isobutylene are disclosed. The processes may include supplying a mixed C4 feed stream to a catalytic distillation column, which may contain a butene isomerization catalyst. 1-butene is isomerized to 2-butene and concurrently in the catalytic distillation column the 2-butene is separated from the isobutane and isobutylene. The overheads fraction comprising the isobutane and isobutylene is then condensed in an overheads system and fed to a splitter, where the isobutane is separated from the isobutylene. The process further includes operating the catalytic distillation column at an overheads temperature greater than a bottoms temperature of the splitter, and heating a portion of the splitter bottoms stream via indirect heat exchange with at least a portion of the catalytic distillation column overheads fraction, thereby producing a heated bottoms stream (reboil vapor) fed to the splitter and a cooled overheads fraction.

A method is described for producing a polycarbonate by reacting one or more diaryl carbonates with one or more aromatic hydroxy compounds, which are first mixed in a mixing device and enter, as a raw material mixture, a raw material mixture container to subsequently react in one or more reactors under reduced pressure and increased temperature to form polycarbonate, wherein the mixture of diaryl carbonate and aromatic hydroxy compound is subjected to a purification by an inert gas in a countercurrent process, in a stripping device, before entering the raw material mixture container. The present invention also relates to a stripping device which is particularly suitable for purifying a raw material mixture stream, and to the use of such a stripping device in a method for producing polycarbonate.

The present disclosure relates to a method and an apparatus for decomposing a phenolic by-product generated in a bisphenol A preparation process, the method including: a step (S10) of feeding the phenolic by-product to a multistage reactive distillation column; a step (S20) of separating the phenolic by-product into an upper discharge stream containing an active component, a side discharge stream containing acetophenone, and a bottom discharge stream containing tar by the multistage reactive distillation column; and a step (S30) of mixing the side discharge stream discharged from the multistage reactive distillation column and the bottom discharge stream discharged from the multistage reactive distillation column to form a mixed discharge stream.

Provided is a device for producing ultra-low sulfur biodiesel. The device for producing ultra-low sulfur biodiesel is a two-stage processing device, comprising a two-stage purification unit, a two-stage enzyme reaction unit, a two-stage distillation unit, and a decompression rectification unit. The present invention is green and environment-friendly, effectively and completely removing sulfur-containing impurities from the raw material, eliminating the attack of a sulfur-containing group in the synthesis process on fatty acids, and providing sufficient conditions for obtaining ultra-low sulfur content methyl esters in the product section.

The invention pertains to a urea production process using a high pressure stripper and a low pressure decomposer connected to a low pressure carbamate condenser which is in heat exchanging contact through a wall with a sub-atmospheric decomposer wherein urea solution obtained from the low pressure decomposer is processed.

Optimized, heat-integrated methods and systems are provided to produce multiple, high-value products from oil shale, while minimizing overall energy and water usage. A method for producing multiple products from oil shale comprises: feeding raw oil shale into a heated retorting unit, to convert kerogen into a retorted stream; introducing the retorted stream to a distillation column to generate a high-cetane diesel stream, an -olefin-containing chemical stream, an asphalt/asphalt additive stream, and an overhead gas stream, wherein heat contained in the retorted stream is harnessed as distillation energy; separating the overhead gas stream into a fuel gas stream and a purge gas stream; combusting the fuel gas stream to generate hot flue gas; heating the purge gas with hot flue gas; feeding the heated purge gas directly to the heated retorting unit; and recovering the high-cetane diesel stream, the -olefin-containing chemical stream, and the asphalt/asphalt additive stream as products.