Kev Siv thiab Cov Txheej Txheem Sib Txawv ntawm n-Butane, Isobutane, n-Butene thiab Isobutene

Tag nrho plaub yam yog C4 hydrocarbon Cheebtsam, muab faib ua alkanes (saturated: n-butane, isobutane) thiab olefins (unsaturated: n-butene, isobutene). Lawv qhov kev sib txawv tseem ceeb nyob hauv qhov olefins muaj cov pa roj carbon -carbon ob daim ntawv cog lus thiab feem ntau yog siv rau kev siv tshuaj lom neeg, thaum alkanes tsis muaj ob daim ntawv cog lus thiab feem ntau yog siv los ua roj, tub yees thiab cov khoom ua npuas dej, ua rau kom muaj kev sib cais ntawm cov khoom lag luam hauv qab.

I. Cov ntawv thov tseem ceeb ntawm Plaub Monomers

1. n-Butane (n-C₄H₁₀, ncaj-chain saturated alkane)

Civil & industrial roj: Blended rau hauv LPG thiab tsheb roj roj

Cov khoom siv tshuaj

Dehydrogenation los tsim n-butene thiab butadiene (raw khoom rau cis-butadiene roj hmab)

Oxidation rau maleic anhydride (raws li raw khoom rau unsaturated resins thiab coatings)

Foaming agent thiab refrigerant: Rau EPS foamed polystyrene thiab aerosol propellants

Refining: Blending tivthaiv rau roj av

2. Isobutane (i-C₄H₁₀, branched saturated alkane)

Feedstock rau alkylate roj (sab saum toj daim ntawv thov nyob rau hauv cov roj refining): Reacts nrog olefins los tsim high- octane roj av, ib tug tseem ceeb raw khoom rau National VI standard gasoline

Refrigerant (R600a): Eco-cov tub yees zoo rau cov tub yees thiab lub tub yees (hloov CFCs, nrog rau kev lag luam loj)

Dehydrogenation rau isobutene (qhov tseem ceeb tshaj plaws hauv kev tsim tshuaj lom neeg)

Foaming agents, aerosols thiab portable roj roj

✅ Cov yam ntxwv ntawm alkanes: Saturated thiab chemically inert; tsis tuaj yeem polymerize ncaj qha. Feem ntau undergo dehydrogenation los tsim olefins ua ntej ntxiv kev sib sib zog nqus.

3. n-Butene (1-butene, 2-butene, ncaj-chain olefin)

Comonomer rau LLDPE (qhov loj tshaj plaws noj): Hloov kho cov kab polyethylene yas los txhim kho zaj duab xis toughness

Hydration rau sec-butanol, ces methyl ethyl ketone (MEK, siab-kawg hnyav rau txheej thiab inks)

Oligomerization rau lubricants thiab roj av

Oxidation, epoxybutane ntau lawm thiab zoo tshuaj intermediates

4. Isobutene (2-methylpropene, branched olefin, siab tshaj tus nqi-ntxiv C4 khoom)

MTBE (gasoline antiknock agent): Synthesized nrog methanol, lub ntiaj teb no daim ntawv thov kev noj sab saum toj

Polyisobutene (PIB): Lubricant additives, kub yaj adhesives thiab sealants

Raw khoom rau butyl roj hmab: Copolymerized nrog isoprene rau log tsheb puab thiab sealing gaskets

Methyl methacrylate (MMA, raw khoom rau PMMA acrylic iav)

Tert-butanol, tert-butyl phenol thiab roj av additives

✅ Cov khoom sib xws ntawm olefins: Cov pa roj carbon ntau- carbon ob daim ntawv cog lus, yooj yim rau polymerize, ntxiv thiab esterify; core raw cov ntaub ntawv rau siab - kawg zoo tshuaj.

II. Summary Table of Four Core Differences

III. Qhov Tseem Ceeb Qhov txawv

1. Saturated vs Unsaturated (Pib faib kab)

n-Butane & isobutane: Saturated alkanes tsis muaj ob daim ntawv cog lus, muaj kev cuam tshuam loj heev. Feem ntau yog siv los ua cov roj thiab cov tub yees; dehydrogenation yog xav tau rau kev sib sib zog nqus chemical ua.

n-Butene & isobutene: Unsaturated olefins nrog cov pa roj carbon ntau-carbon ob daim ntawv cog lus; tsis muaj cracking xav tau, ncaj qha siv nyob rau hauv ntau yam zoo tshuaj productions.

2. Ncaj-chain vs Branched-chain (Secondary Dividing Line)

Ceg cov qauv (isobutane, isobutene): Cov qauv molecular compact, siab roj av octane ntsuas; haum rau synthesizing siab -tus nqi branched tshuaj xws li MTBE, butyl roj hmab thiab R600a.

Ncaj- cov qauv saw (n-butane, n-butene): Cov kab hluav taws xob, muaj feem xyuam rau cov txiv neej anhydride, linear PE, MEK thiab lwm yam khoom siv tawm.

3. Kev Lag Luam Volume & Nqe Variations

Isobutane: Dual rigid thov los ntawm cov roj refining thiab cov khoom siv hauv tsev tub yees, qhov ntim ntau tshaj plaws ntawm plaub yam khoom.

Isobutene: Lub qab nthab ntawm tus nqi ntxiv hauv C4 kev lag luam tshuaj, tsis tu ncua tswj tus nqi lag luam siab tshaj plaws txhua xyoo puag ncig.

n-Butene: Kev thov nruj los ntawm kev lag luam petrochemical yas; Kev noj haus hloov pauv nrog kev ua haujlwm ntawm LLDPE cov nroj tsuag.

n-Butane: Ib nrab ntawm cov zis yog siv los ua pej xeem LPG; Kev thov tshuaj lom neeg yog khi rau kev ua haujlwm ntawm maleic anhydride thiab butadiene units.

IV. Tswv yim Distinction rau Tshuaj Txawv Teb Chaws Trade

Maleic anhydride rau fiberglass -cov khoom siv ntxiv, EPS foams, cov pa roj liquefied → n-butane

Cov tub yees rau tub yees, alkylate roj av rau refineries → Isobutane

Cov ntaub ntawv nyoos rau PE zaj duab xis, MEK number case solvents → n-Butene

Acrylic iav, butyl roj hmab, roj av MTBE → Isobutene

V. Cov ntaub ntawv qhia txog lub cev thiab tshuaj lom neeg muaj kev phom sij (CAS / UN / Boiling Point / Hazard Classification, Yuav Tsum Tau Txais Kev Cai Tshaj Tawm)

VI. Qhov sib txawv ntawm Kev Cia & Kev Thauj Mus Los (Key rau Warehousing, Tank Truck thiab Export Tank Containers)

n-Butane: Gaseous nyob rau hauv ib txwm kub thiab siab; thauj los ntawm lub tank siab cia lossis LPG tank tsheb. Nruab nrab liquefaction siab, feem ntau xa mus rau hauv T50 tank ntim rau export. Yooj yim rau vaporization nyob rau hauv qhov kub thiab txias; txwv tsis pub tiv thaiv tshav ntuj ncaj qha.

Isobutane: txo qis qhov kub thiab txias dua; tuaj yeem khaws cia rau hauv tub yees lossis lub tank siab. Cov tub yees manufacturers yuav nyob rau hauv tej ntawm lub siab tankers thiab tuav ruaj khov Tshuag rau R600a ntau lawm.

n-Butene: Khaws thiab thauj hauv lub xeev liquefied nrog lub tank siab; spherical tso tsheb hlau luam tau nruab rau hauv cov nroj tsuag petrochemical rau ruaj cia hauv chaw ua si tshuaj. Feem ntau muab rau PE factories los ntawm cov kav dej tshwj xeeb.

Isobutene: Cov tshuaj ua haujlwm siab tshaj plaws thiab ua rau nws tus kheej -polymerization. Yuav tsum tau tswj qhov kub thiab txias thiab me me ntawm polymerization inhibitors thaum khaws cia thiab kev thauj mus los hauv lub tank siab. Cov qauv ntsuas kub siab dua li lwm yam peb cov khoom; Insulated T50 tso tsheb hlau luam tau dav siv rau kev thauj mus los ntev - deb.

VII. Ntxiv Kev Paub Txog Kev Lag Luam Kev Lag Luam

Rising maleic anhydride ua lag luam tus nqi → Synchronous nce hauv kev yuav khoom ntim ntawm n-butane

Peak ntau lawm lub caij ntawm tub yees → Upward price trend of isobutane

Txhim kho kev khiav hauj lwm ntawm cov nroj tsuag yas → Nqe nce ntawm n-butene

Kev vam meej kev lag luam ntawm roj hmab / PMMA → Nqe nce ntawm isobutene

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