《化学工艺学》课程PPT教学课件（英文讲稿）Chapter 7 Selective oxidation of hydrocarbon

Chapter 7Selective oxidation of hydrocarbon

Selective oxidation of hydrocarbon Chapter 7

Main contentsIntroductionHomogeneous catalytic oxidationHeterogeneous catalytic oxidationEthylene oxide preparation by ethene epoxidationAcrylonitrile preparation by propene ammoxidationPhthalic anhydride preparation by aromatic oxidation

Main contents Ethylene oxide preparation by ethene epoxidation Heterogeneous catalytic oxidation Homogeneous catalytic oxidation Introduction Acrylonitrile preparation by propene ammoxidation Phthalic anhydride preparation by aromatic oxidation

7.1IntroductionA series of important products, such as alcohols.aldehydes,carboxylic acids,ketones,and esters,canbe obtained byoxidationreactions of hvdrocarbonsThese products are an important organic chemicalraw materials andintermediates, and some areimportant monomers of three synthetic materials

7.1 Introduction A series of important products, such as alcohols, aldehydes, carboxylic acids, ketones, and esters, can be obtained by oxidation reactions of hydrocarbons. These products are an important organic chemical raw materials and intermediates, and some are important monomers of three synthetic materials

Con.%Selv.%AirHC-CH98750HC- CH,OmCH3Air79100CH3儿0

Con.% Selv.% Air HC HC CH2 CH2 O 98 75 CH3 CH3 Air C C O O O 100 79

NH3,AirC= C-CC = C-CNOxygenC=COxygenC=C-C0Oxygen11C=CC- C-H

C C C NH3 ,Air C C CN C C Oxygen C C O C C C Oxygen C C C O C C Oxygen O Ｃ- C-H

Characteristics of oxidation process and selection of oxidants1.Characteristics of oxidationreactionsLarge amount ofreaction heat releasesReactionisirreversibleOxidationpathwayis complexProcess isflammableandexplosive

一、Characteristics of oxidation process and selection of oxidants 1. Characteristics of oxidation reactions ⚫ Large amount of reaction heat releases ⚫ Reaction is irreversible ⚫ Oxidation pathway is complex ⚫ Process is flammable and explosive

2.Selection of oxidantsAirOxygenHydrogenperoxideOtherperoxideHydrocarbon peroxide or peroxy acid

2. Selection of oxidants ⚫ Air ⚫ Oxygen ⚫ Hydrogen peroxide ⚫ Other peroxide ⚫ Hydrocarbon peroxide or peroxy acid

二. Classificationfor selective oxidation process ofhydrocarbonOxidation reactions without chain scissionOxidation reactions with chain scissionOxidation condensation reactions

二、Classification for selective oxidation process of hydrocarbon ⚫ Oxidation reactions without chain scission ⚫ Oxidation reactions with chain scission ⚫ Oxidation condensation reactions

Catalytic oxidation of hydrocarbonHomogeneous catalyticoxidationHeterogeneouscatalytic oxidationCatalyticautoxidationCoordinationcatalyticoxidationEthyleneoxidepreparedAcetic acid preparedbyetheneepoxidationbyacetaldehyde oxidationAcetaldehyde preparedbyetheneoxidation

Catalytic oxidation of hydrocarbon Ethylene oxide prepared by ethene epoxidation Acetaldehyde prepared by ethene oxidation Acetic acid prepared by acetaldehyde oxidation Homogeneous catalytic oxidation Heterogeneous catalytic oxidation Catalytic autoxidation Coordination catalytic oxidation

7.2Homogeneous catalytic oxidationCharacteristicsActivityishigh,selectivityishighReaction conditions are nottoo strict,the reactions arerather stable.Equipmentsare simple,volumeisless,productioncapacity is higher.Reaction temperature is not high, the utilization of thereaction heatis lowerSpecialreactormaterials mustbeused as strongercorrosive systemCatalysts are noble metals,andmustbe separated andrecovered

7.2 Homogeneous catalytic oxidation ⚫ Activity is high, selectivity is high. ⚫ Reaction conditions are not too strict, the reactions are rather stable. ⚫ Equipments are simple, volume is less, production capacity is higher. ⚫ Reaction temperature is not high, the utilization of the reaction heat is lower. ⚫ Special reactor materials must be used as stronger corrosive system. ⚫ Catalysts are noble metals, and must be separated and recovered. Characteristics