A method and a device system for producing dimethyl oxalate through high-pressure carbonylation of industrial synthesis gases and producing ethylene glycol through dimethyl oxalate hydrogenation. The method comprises the following steps: adopting industrial NO, O.sub.2 and methanol as raw materials to perform an esterification reaction to produce methyl nitrite, then adopting industrial CO and methyl nitrite to perform a carbonylation reaction in a plate reactor to produce carbonylation products which mainly include dimethyl oxalate and dimethyl carbonate, separating the carbonylation products to obtain dimethyl carbonate products, and subsequently performing hydrogenation to dimethyl oxalate in the plate reactor to produce ethylene glycol products; and performing coupling recovery treatment to waste acid in the esterification reaction and purge gas in the carbonylation reaction for recycling. The system comprises an esterification reaction system, a carbonylation reaction system, a purge gases and waste acid coupling recovery system and a hydrogenation reaction system.

The present disclosure relates to a method of sequestering carbon dioxide which comprises the steps of capturing carbon dioxide from an industrial gaseous waste stream and/or the atmosphere, converting a CO.sub.2 from the CO.sub.2 gas stream into a (COOH).sub.2 and combining the (COOH).sub.2, a mono-alcohol (X-OH), preferably CH.sub.3CH.sub.2OH, and a first acid catalyst comprising a H.sub.2SO.sub.4 at a temperature ranging from about 80? C. to about 100? C. and under atmospheric pressure to produce an ester comprising a (COOX).sub.2 and preferably (COOEt).sub.2; and the ester obtained is reacted with a polyol, preferably glycerine to form a polyester, preferably the polyester is a hydrogel. The present disclosure further relates to the use of a hydrogel which is obtainable by said method.

The present disclosure relates to a method of sequestering carbon dioxide which comprises the steps of capturing carbon dioxide from an industrial gaseous waste stream and/or the atmosphere, converting a CO.sub.2 from the CO.sub.2 gas stream into a (COOH).sub.2 and combining the (COOH).sub.2, a mono-alcohol (X-OH), preferably CH.sub.3CH.sub.2OH, and a first acid catalyst comprising a H.sub.2SO.sub.4 at a temperature ranging from about 80? C. to about 100? C. and under atmospheric pressure to produce an ester comprising a (COOX).sub.2 and preferably (COOEt).sub.2; and the ester obtained is reacted with a polyol, preferably glycerine to form a polyester, preferably the polyester is a hydrogel. The present disclosure further relates to the use of a hydrogel which is obtainable by said method.

Valorization methods herein relate to undesired by-products containing compounds including the optical isometry D, in particular D-lactic acid and D-lactic acid esters. An illustrative valorization method is disclosed wherein a flux containing undesired D-lactic acid and/or undesired D-lactic acid ester(s) is subjected to a treatment in order to selectively separate a fraction rich in L-lactic acid and/or L-lactic acid ester(s) from a fraction containing D-lactic acid and/or D-lactic acid ester(s), thereby improving the efficiency of the production of L-PLA.

Valorization methods herein relate to undesired by-products containing compounds including the optical isometry D, in particular D-lactic acid and D-lactic acid esters. An illustrative valorization method is disclosed wherein a flux containing undesired D-lactic acid and/or undesired D-lactic acid ester(s) is subjected to a treatment in order to selectively separate a fraction rich in L-lactic acid and/or L-lactic acid ester(s) from a fraction containing D-lactic acid and/or D-lactic acid ester(s), thereby improving the efficiency of the production of L-PLA.

To provide a new compound with pores finely tunable in size so as to take up a specific element and release the specific element taken up in the pores as necessary, a synthesis method of the new compound, and a separation and recovery agent. The new compound represented by the following molecular formula:

(NH.sub.4)[Ln(C.sub.2O.sub.4).sub.2(H.sub.2O)]

wherein Ln represents a lanthanide selected from Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

To provide a new compound with pores finely tunable in size so as to take up a specific element and release the specific element taken up in the pores as necessary, a synthesis method of the new compound, and a separation and recovery agent. The new compound represented by the following molecular formula:

(NH.sub.4)[Ln(C.sub.2O.sub.4).sub.2(H.sub.2O)]

wherein Ln represents a lanthanide selected from Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

A new catalyst that includes palladium on a cerium dioxide support, of formula PdX/CeO2, in which X represents the empty set or a doping element, and its use in the implementation of a method for selectively preparing oxalates or oxamides from carbon monoxide, an oxidant, in particular molecular oxygen or air, and an alcohol or an amine respectively.

A new catalyst that includes palladium on a cerium dioxide support, of formula PdX/CeO2, in which X represents the empty set or a doping element, and its use in the implementation of a method for selectively preparing oxalates or oxamides from carbon monoxide, an oxidant, in particular molecular oxygen or air, and an alcohol or an amine respectively.

Provided is a production device including: a first reactor to form a second gas containing an ester and nitric oxide from a first gas containing carbon monoxide, a nitrite, and nitric oxide; an absorption column to separate the second gas and an absorbing solution into a condensate containing the ester and a noncondensable gas; a second reactor to introduce an alcohol, the noncondensable gas, and oxygen gas thereinto to form a third gas containing nitric oxide and a nitrite; a third reactor to form a fourth gas containing a nitrite from the noncondensable gas and a bottom liquid from the second reactor and to feed the fourth gas to the second reactor; a first measurement unit to measure the concentration of a nitrite in the first gas; and a first flow rate-adjusting unit to adjust the amount of the noncondensable gas to the third reactor based on the concentration.