Uhlalutyo lwendima yeCatalytic yeSodium Cyanide kuShishino lwePetrochemical

intshayelelo

I-Sodium cyanide (NaCN), njengekhompawundi ebalulekileyo ye-inorganic, ibonisa iziphumo ezibalulekileyo ze-catalytic kwi- Petrochemical Industry ngenxa yeempawu zayo ezikhethekileyo zeekhemikhali. I-alkalinity yayo enamandla, amandla okulungelelanisa, kunye ne-nucleophilicity yenza ukuba ibe yi-catalyst okanye isongezo esibalulekileyo kwiindlela ezahlukeneyo zeekhemikhali. Eli nqaku liza kuxoxa ngendima yayo kwi-petrochemical industry kwiinkalo ezifana ne- Catalytic Mechanism , amasimi okusetyenziswa, kunye nokhuseleko.

I. I-Catalytic Mechanism yeSodium Cyanide

1.Ukwenziwa kweeNgxaki zeMetal

I-CN⁻ ion inamandla amakhulu okulungelelanisa kwaye inokwenza ii-complexes ezizinzileyo ezinee-transition metals (ezifana ne-Ni, i-Co, i-Fe, njl.njl.). Ezi complexes zinokuvuselela ii-substrate molecules kwii-catalytic reactions kwaye zinciphise amandla okusebenza kwe-reaction. Umzekelo, kwi-hydrocyanation ye-olefins, i-catalyst eyenziwe yi -Sodium Cyanide kunye ne-nickel salts inokukhuthaza ngokufanelekileyo i-reaction ye-olefins kunye ne-HCN ukuvelisa i-Nitrile Compound s.

2.Nucleophilic Catalysis

Njengesiseko esomeleleyo, i-sodium cyanide inokubonelela nge-CN⁻ njenge-reagent ye-nucleophilic ukuze ithathe inxaxheba kwi-nucleophilic substitution okanye kwi-addition reactions. Umzekelo, kwi-cyanidation ye-halogenated hydrocarbons, i-CN⁻ ithatha indawo ye-halogen ukuze yenze ii-nitrile compounds, eziyindlela ebalulekileyo yokwenziwa kwee-organic nitriles.

3. Ukulawulwa kweNdawo yeAlkaline

I-sodium cyanide hydrolyzes ukuvelisa i-NaOH kunye ne-HCN, enokulawula ixabiso le-pH yenkqubo yokuphendula kunye nokukhuthaza ukusabela okuthile kwe-acid-base catalytic (njenge-hydrolysis okanye i-condensation ye-esters).

II. Izicelo eziqhelekileyo kuShishino lwePetrochemical

1.Ukwenziwa kweeNdibaniselwano zeNitrile

• Ukuveliswa kwe-Acrylonitrile : Kwinkqubo yokufakwa kwe-propylene ukuze kuveliswe i-acrylonitrile, i-Sodium cyanide ingasetyenziswa njenge-catalyst additive ukuphucula ukukhetha kunye nokukhupha i-reaction.

• Ukwenziwa kwe-Adiponitrile : Ngokusebenzisa i-hydrocyanation reaction ye-1.3-butadiene, i-sodium cyanide ikhuthaza ukwakheka kwe-adiponitrile, eyimveliso ebalulekileyo ye-nylon-66.

2.I-Carbonylation Synthesis kunye ne-Hydrogenation Reactions

• Kwi-carbonylation synthesis reaction, i-sodium cyanide yenza i-synergistically kunye ne-cobalt catalyst ukukhuthaza ukusabela okongeziweyo kwe-olefins kunye ne-CO kunye ne-H₂ ukuvelisa i-aldehyde okanye iikhompawundi zotywala.

• Njengokongeza kwiimpendulo ze-hydrogenation, i-sodium cyanide inokulawula umgangatho we-elektroniki we-catalyst yesinyithi kunye nokuphucula umsebenzi wokuphendula.

3.Ipetroleum Cracking kunye neDesulfurization

• Ngethuba lenkqubo yokuqhaqha i-petroleum, i-sodium cyanide inokuthintela ukuphendulwa kwe-coking kunye nokwandisa ubomi benkonzo ye-catalyst.

• Isetyenziselwa ukukhutshwa kweekhompawundi ezinesulfure (ezifana nokususwa kwe-mercaptan). Ngokusebenzisa i-nucleophilic substitution reactions, i-mercaptans iguqulwa ibe yi-sulfides okanye i-disulfides.

III. Izinto eziluncedo kunye nemingeni

eziluncedo:

• Umsebenzi ophezulu we-catalytic kunye nokukhetha, okufanelekileyo kwiinkqubo ezahlukeneyo zokuphendula eziyinkimbinkimbi.

• Iindleko eziphantsi kwaye zilula kwisicelo soshishino.

mngeni:

• Umngcipheko wobutyhefu : I-sodium cyanide iyingozi kakhulu, kwaye kufuneka ulawulo oluqinileyo lweemeko zokusebenza ukuze kuthintelwe ukuvuza okanye ukudibana.

• Imiba Yendalo : Amanzi amdaka aqulethe i-cyanide kufuneka aphathwe (njengokusebenzisa i-alkaline chlorination) ukuze ahlangabezane nemigangatho yokukhupha amanzi ukuze kuthintelwe iingozi zendalo.

• Ukhuphiswano oluvela kwiiTekhnoloji eziNye : Ngophuhliso lwekhemistri eluhlaza, i-biocatalysis okanye ii-ionic liquid catalysts zithatha indawo yeenkqubo ezithile ze-sodium cyanide kancinci kancinci.

IV. Ukhuseleko kunye neMilinganiselo yoKhuseleko lokusiNgqongileyo

1. Ukhuseleko lweMveliso : Sebenzisa izixhobo ezivaliweyo, uxhotyiswe ngesixhobo sokufumanisa i-hydrogen cyanide kunye ne-alamu, kwaye abaqhubi kufuneka banxibe iimpahla zokuzikhusela kunye neemaski zegesi.

2. Unyango lwamanzi amdaka : Guqula i-CN⁻ ibe yi-CO₂ engeyiyo ityhefu kunye ne-N₂ ngendlela ye-oxidation (njengokusebenzisa i-ClO₂ okanye i-H₂O₂).

3. Ukuphucula Inkqubo : Phuhlisa ubuchwepheshe bokusebenzisa kwakhona ukunciphisa ukusetyenziswa kwe-sodium cyanide; hlola iinkqubo ze-catalytic ezingenayo i-cyanide (ezifana nokusebenzisa ii-nitriles ze-organic njengezinye izinto ezithatha indawo yazo).

isiphelo

I-sodium cyanide, eneempawu zayo ezizodwa, idlala indima ebalulekileyo kushishino lwepetrochemical, ngakumbi kwimimandla efana ne-nitrile synthesis kunye ne-carbonylation reactions, apho ingenakuphinda ibuyiselwe. Nangona kunjalo, ubutyhefu bayo kunye nemingcipheko yokusingqongileyo ikwaqhuba ishishini ukuba liguqukele kubuchwephesha obukhuselekileyo nobuluhlaza. Kwixesha elizayo, kunye nenkqubela phambili yoyilo lwe-catalyst kunye nokulungiswa kwenkqubo, ukusetyenziswa kwe-sodium cyanide kuya kusebenza ngakumbi kwaye kuzinzileyo.