公开(公告)号：US10859261B2

公开(公告)日：2020-12-08

申请号：US16093932

申请日：2017-04-06

Applicant: DALIAN INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES

Inventor： Weizhen Li ,  Zhiqiang Chen ,  Jingcai Zhang ,  Chuntian Wu ,  Tao Zhang

IPC: F23N5/20 ,  F23C13/02 ,  F23C13/08 ,  F23D14/02 ,  F23D14/18 ,  F23C13/00

Abstract: A catalytic flameless combustion apparatus has a fuel inlet, a combustion-supporting gas inlet, a gas premixer, a combustion plate, an igniter, a gas deflector, a flameless combustion cavity, a catalyst filled in the flameless combustion cavity, a gas collection chamber and an exhaust port. The method for starting the catalytic flameless combustion apparatus includes initially combusting and heating the flameless combustion cavity and the catalyst filled therein with low power flame; and then increasing flow velocity and switching to high power flame for conducting catalytic flameless combustion. The catalytic flameless combustion apparatus can be used for various non-solid fuel combustion and heat extraction processes.

公开(公告)号：US09926251B2

公开(公告)日：2018-03-27

申请号：US15521033

申请日：2015-11-26

Applicant: DALIAN INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES

Inventor： Tao Zhang ,  Shuo Al ,  Mingyuan Zheng ,  Aiqin Wang ,  Weizhen Li ,  Xiaodong Wang

IPC: C07C29/80 ,  C07C31/18 ,  C07C1/24 ,  B01D3/06 ,  B01D3/10 ,  B01D15/08 ,  B01J29/40

CPC classification number: C07C29/80 ,  B01D1/26 ,  B01D3/009 ,  B01D3/065 ,  B01D3/10 ,  B01D3/146 ,  B01D15/08 ,  B01J29/40 ,  C07C1/24 ,  C07C29/88 ,  C07C31/18 ,  C07C31/202

Abstract: This invention discloses an approach for the separation of the close-boiling mixture of polyols. The raw material is ethylene glycol containing miscellaneous polyols (such as 1,2-propylene glycol and 1,2-butanediol). Over an acid catalyst, these miscellaneous polyols, through (1) a dehydration reaction, (2) pinacol rearrangement, and (3) acetalization or ketalization reaction, are converted into aldehydes (small amounts), acetals, and ketals (trace amount), which are simultaneously and readily separated via distillation. Meanwhile, after the reaction, the mixture is further separated to obtain an ethylene glycol product at a high purity. The invention provides a technique to remove the miscellaneous polyols from ethylene glycol via liquid-phase dehydration reactions under mild conditions, with low energy consumption. In particular, this approach is markedly effective for the removal of 1,2-butanediol that is difficult to be removed via conventional techniques. The purity of the resulting ethylene glycol product is high, and value-added acetals or ketals are co-produced.