公开(公告)号：JPH11199559A

公开(公告)日：1999-07-27

申请号：JP26552498

申请日：1998-09-18

Applicant: STANDARD OIL CO OHIO

Inventor： SOCKELL EDWARD J ,  SARNA JOSEPH C ,  KERR ALI ,  GODBOLE SANJAY P

IPC: C07C253/24 ,  C07C253/26 ,  C07C253/34 ,  C07C255/08

Abstract: PROBLEM TO BE SOLVED: To improve HCN recovery rate in the production of acrylonitrile. SOLUTION: This production process of (meth)acrylonitrile comprises the step of transferring a discharged material obtained in the ammoxidation of propylene, etc., to a quenching column, and cooling the hot exhaust gas with a water fume, the step of passing the cooled reaction discharged material to an absorption column from an overhead to absorb a crude acrylonitrile or methacrylonitrile with water, and the step of passing the obtained vapor flow containing HCN through a product cooling device and then a knockout pot, and also comprises bringing the cooled HCN product in contact with a water flow as an improved point.

公开(公告)号：JPH11322696A

公开(公告)日：1999-11-24

申请号：JP33815698

申请日：1998-11-27

Applicant: STANDARD OIL CO OHIO

Inventor： GRAHAM ANNE M ,  GODBOLE SANJAY P ,  LEE DANIEL G

IPC: C07C5/08 ,  C07C253/26 ,  C07C253/34 ,  C07C255/08

Abstract: PROBLEM TO BE SOLVED: To obtain a specific unsaturated mononitrile useful as a monomer for a polymerizing reaction without contamination with an impurity by reacting a specific olefin, ammonia, etc., in the presence of a catalyst, reducing the pH of an aqueous stream used till the recovery and purification before recycling and then reducing the amount of the trace impurity. SOLUTION: An olefin selected from propylene and isobutylene is reacted with ammonia and oxygen in the presence of a catalyst in a reactor zone. A reactor effluent containing the produced unsaturated mononitrile from the reactor is then brought into contact with at least a first aqueous stream in a quenching column and cooled. The cooled reactor effluent is subsequently brought into contact with at least a second aqueous stream in an absorption column to separate and remove a bottom stream containing the unsaturated mononitrile. The resultant bottom stream is then moved to a recovery and purification section and the pH of at least one aqueous process stream is reduced before recycling to thereby reduce the amount of a trace impurity. The resultant bottom stream is further recycled to afford the objective compound selected from acrylonitrile and methacrylonitrile.

公开(公告)号：JPH107639A

公开(公告)日：1998-01-13

申请号：JP1299397

申请日：1997-01-27

Applicant: STANDARD OIL CO OHIO

Inventor： GIBSON JAMES S ,  RINKER JEFFREY E ,  WACHTENDORF PAUL T ,  GODBOLE SANJAY P

IPC: C07B63/00 ,  C07C5/08 ,  C07C253/26 ,  C07C253/32 ,  C07C253/34 ,  C07C255/03 ,  C07C255/08

Abstract: PROBLEM TO BE SOLVED: To obtain the subject high-quality compound in a short time by cooling an effluent gas of an ammoxidation reactor by a quenching column, absorbing a product in water by an absorbing column, separating the absorbed substance into a water and an organic layers and collecting the product from the organic layer. SOLUTION: A reactor effluent obtained by the ammoxidation of propylene or isobutylene is transferred to a quenching column and a hot effluent gas is cooled by bringing it into contact with mist. The cooled reactor effluent overhead is passed through a conduit 1 to the bottom of an absorbing column 5 to absorb crude acrylonitrile or methacrylonitrile in water introduced through a conduit 3. Then the solution is sent through a first distillation column 13 to a first decanter 19 to form a first water layer and a first organic layer containing acrylonitrile or methacrylonitrile. The first organic layer is transferred a second distillation column 27 to a second decanter 33 to form a second water layer and a second organic layer to recover the objective compound from the second organic layer.

公开(公告)号：ZA9810259B

公开(公告)日：1999-05-18

申请号：ZA9810259

申请日：1998-11-10

Applicant: STANDARD OIL CO OHIO

Inventor： GRAHAM ANNE M ,  GODBOLE SANJAY P ,  LEE DANIEL G

IPC: C07C5/08 ,  C07C253/26 ,  C07C253/34 ,  C07C255/08 ,  C07C

Abstract: A process for manufacturing an unsaturated mononitrile selected from the group consisting of acrylonitrile and methacrylonitrile comprising reacting an olefin selected from the group consisting of propylene and isobutylene, ammonia and oxygen in a reactor zone in the presence of a catalyst to produce a reactor effluent containing the corresponding unsaturated mononitrile, transferring the reactor effluent containing the unsaturated mononitrile to a quench column wherein the reactor effluent containing the unsaturated mononitrile is contacted with at least a first aqueous stream to cool the reactor effluent, transferring the cooled reactor effluent containing the unsaturated mononitrile to an absorption column wherein the reactor effluent containing unsaturated mononitrile is contacted with at least a second aqueous stream to separate and remove the unsaturated mononitrile as a bottom stream from the absorption column, transferring the bottom stream containing the unsaturated mononitrile to a recovery and purification section where the unsaturated mononitrile is recovered and purified, and recycling at least one aqueous process stream to improve the efficiency of the process wherein the improvement comprises treating at least one aqueous stream before recycling into the process stream to reduce the pH thereby reducing the amount of trace impurities present in the aqueous recycle stream.

公开(公告)号：BR9805434A

公开(公告)日：1999-12-14

申请号：BR9805434

申请日：1998-11-26

Applicant: STANDARD OIL CO OHIO

Inventor： GRAHAM ANNE M ,  GODBOLE SANJAY P ,  LEE DANIEL G

IPC: C07C5/08 ,  C07C253/26 ,  C07C253/34 ,  C07C255/08

Abstract: A process for manufacturing an unsaturated mononitrile selected from the group consisting of acrylonitrile and methacrylonitrile comprising reacting an olefin selected from the group consisting of propylene and isobutylene, ammonia and oxygen in a reactor zone in the presence of a catalyst to produce a reactor effluent containing the corresponding unsaturated mononitrile, transferring the reactor effluent containing the unsaturated mononitrile to a quench column wherein the reactor effluent containing the unsaturated mononitrile is contacted with at least a first aqueous stream to cool the reactor effluent, transferring the cooled reactor effluent containing the unsaturated mononitrile to an absorption column wherein the reactor effluent containing unsaturated mononitrile is contacted with at least a second aqueous stream to separate and remove the unsaturated mononitrile as a bottom stream from the absorption column, transferring the bottom stream containing the unsaturated mononitrile to a recovery and purification section where the unsaturated mononitrile is recovered and purified, and recycling at least one aqueous process stream to improve the efficiency of the process wherein the improvement comprises treating at least one aqueous stream before recycling into the process stream to reduce the pH thereby reducing the amount of trace impurities present in the aqueous recycle stream.

公开(公告)号：BG102955A

公开(公告)日：2000-04-28

申请号：BG10295598

申请日：1998-11-26

Applicant: STANDARD OIL CO OHIO

Inventor： GRAHAM ANNE M ,  GODBOLE SANJAY P ,  LEE DANIEL G

IPC: C07C5/08 ,  C07C253/26 ,  C07C253/34 ,  C07C255/08

Abstract: The invention relates to a method for the manufacturing of unsaturated mononitrile from the group of acrylonitrile and methacrylonitrile. It includes reaction of olefine from the group containing propylene or isobutylene and ammonia and oxygen in a reaction zone in the presence of a catalyst to produce a reactor effluent containing the corresponding unsaturated mononitrile. The effluent runs over a cooling column where, in order to cool, it gets into contact with at least first aqueous stream. The cooled reactor effluent containing the unsaturated mononitrile is transferred into an absorption column where it is contacted with at least a second aqueous stream to separate and remove the unsaturated mononitrile as a bottom stream from the absorption column. The bottom stream containing the unsaturated mononitrile is transferred to a recovery and purification section where the unsaturated mononitrile is recovered and purified. At least one aqueous process stream is recirculated for improving the efficiency of the process consisting in reducing the pH, thereby reducing the amount of trace impurities in the aqueous recirculation stream. 8 claims, 1 figure

公开(公告)号：BG103188A

公开(公告)日：1999-12-30

申请号：BG10318899

申请日：1999-02-22

Applicant: STANDARD OIL CO OHIO

Inventor： GODBOLE SANJAY P ,  WAPPELHORST RICHARD L ,  JACOBSON PAUL A

IPC: B01J39/04 ,  C07C253/34 ,  C07C255/03 ,  C07C255/08 ,  C07C255/00

Abstract: By the method raw acentonitrile containing acrylonitrile asan impurity, and water is supplied in the upper part of thedistillation column. The raw acetonitrile is distilled in thepresence of water for a period of time where the entireacrylonitrile admixture is evaporated in the presence of thewater, the entire acrylonitrile is removed in an upper streamcoming out of the distillation column, and the raw acetonitrile isrecovered free from any acrylonitrile admixture from the lowerpart of the column. The attached figure is a flow chart of theflows in accordance with the invention and is described in greaterdetail in the description.16 claims, 1 figure