Ua li cas PTFE Thaum tshav kub kub Exchanger Nrog Sulfuric Acid Catalyst Slurry hauv Alkylation Chav Cua Kub?

Acid Ib puag ncig rau Alkylation
Nyob rau hauv cov roj av alkylation units, isobutane yog reacted nrog lub teeb olefins nyob rau hauv lub xub ntiag ntawm ib tug sulfuric acid catalyst los tsim high -octane Cheebtsam rau roj av . Acid catalyst yog dhau los ntawm lub reactor ntawm ib tug concentration ntawm 85-98% thiab nqa suspended acid soluble roj, tars thiab sludge hais. Qhov sib tov yog me ntsis corrosive thiab me ntsis abrasive. Cov kua dej ntxhib no yog tawm tsam lub tshav kub exchanger, uas yog tswj cov tshuaj tiv thaiv kub.

Cov khoom siv hluav taws xob sib hloov hluav taws xob, txawm tias muaj siab - cov khoom siv hlau xws li Hastelloy, muaj kev ua haujlwm tsawg hauv huab cua no. Cov kua qaub ua phem rau cov hlau saum npoo thiab txheej txheej ntawm cov khoom siv corrosion yog tsim uas tom qab ntawd degraded los ntawm cov khoom raug tshem tawm. Cov kua qaub tawm tsam cov hlau tshiab raug los ntawm corrosion. Kev yaig- lub voj voog corrosion txhawb kev poob ntawm cov hlau. Lub neej ua haujlwm feem ntau yog 2 txog 5 xyoos; kev hloov pauv yog nquag.

PTFE tiv taus sulfuric acid ntawm txhua qhov concentration thiab ntawm txhua qhov kub txog li 260 degree. Lub homogeneous polymer tsis muaj cov khoom lag luam corrosion hnav. Qhov saum npoo resists tshuaj lom neeg puas tsuaj thiab mechanical nres. Kev sib xyaw ua kom yaig-corrosion mechanism uas rhuav tshem cov khoom siv hlau tsis muaj nyob rau ntawm PTFE.

Lub Synergy ntawm Erosion-Corrosion ntawm Hlau
Hauv kev kho cov kua qaub slurry ntawm cov hlau nplaum, qhov kev puas tsuaj zuj zus los ntawm kev sib koom ua ke. Cov kua qaub tawm tsam cov hlau nto, ua cov txheej txheem ntawm cov khoom siv corrosion - hlau sulfates, oxides thiab hydrates. Cov txheej no hloov tau yooj yim dua thiab tsis muaj nplaum ntau dua li cov hlau hauv qab nws. Lub abrasive hais nyob rau hauv slurry abrade cov khoom corrosion txheej, nthuav tawm cov hlau tshiab. Cov hlau tshiab corrodes sai thiab txheej tshiab ntawm corrosion khoom yog dua degraded.

Lub voj voog no txhim kho tus nqi corrosion thiab tus nqi yaig. Tag nrho tus nqi ntawm cov hlau poob yuav yog 5 mus rau 20 lub sij hawm siab tshaj qhov corrosion tus nqi hauv cov kua qaub uas tsis muaj cov khoom los yog tus nqi yaig nyob rau hauv uas tsis yog - corrosive slurry.

PTFE yuav tsis corrode. Tsis muaj corrosion khoom txheej yog tam sim no. Cov kua qaub ntsib ib qho chemically inert nto. Cov khoom abrasive tuaj yeem ua rau cov neeg kho tshuab qeeb qeeb tsis tau qhov hnav tsis yog ib yam nkaus xwb tab sis kwv yees tau - tsis muaj kev sib koom ua ke. Lub phab ntsa ntawm lub raj yog maj mam muab tshem tawm los ntawm cov neeg kho tshuab ntshiab, ntawm tus nqi ntsuas hauv microns txhua xyoo.

Alkylation Service Parameter PTFE Hastelloy C-276
Acid corrosion tus nqi (particle-dawb) 0.05-0.15 mm / xyoo 0
Tsim cov khoom txheej txheej corrosion Yog Tsis yog
Corrosion khoom txheej yaigYes (ua kom hlau poob) N/A
Erosion-corrosion npaum li cas ua ke 0.25-0.75 mm / xyoo 0.005-0.02 mm / xyoo (tsuas yog siv tshuab siv)
Lub neej ua haujlwm (xyoo) 2-5 15+
Qhov zoo ntawm Sludge Handling
Tus cwj pwm corrosion yog qhov nyuaj ntxiv los ntawm kev nyiam ntawm cov kua qaub soluble roj thiab sludge tam sim no nyob rau hauv alkylation acid rau tso rau ntawm qhov chaw tshav kub exchanger, tsim ib txheej fouling uas ua raws li rwb thaiv tsev rau cov hlab. Corrosion khoom coatings nyob rau hauv metallic nto tsim ib tug ntxhib siab zog nto kom nyiam sludge deposition. Lub muck tsim, hardens, thiab yuav tsum tau muab tshem tawm mechanically.

PTFE muaj ib tug du nto nrog tsawg nto zog ua rau nws nyuaj rau sludge mus ua raws li. Cov sludge hais glide hla lub raj nto yam tsis muaj adhering. Ib me ntsis muck uas tau tso tseg tsuas yog ntxuav tam sim ntawd. Tsis muaj cov sludge tshem tawm ib ntus, yog li qhov saum npoo tseem huv si thiab hloov hluav taws xob tseem nyob ruaj khov.

Cov txheej txheem Compatibility Bonus
PTFE tsis cuam tshuam los ntawm sulfuric acid dhau ntawm tag nrho cov spectrum ntawm alkylation acid compositions -los ntawm cov kua qaub tshiab ntawm 98% rau siv cov kua qaub ntawm 85% nrog yaj hydrocarbons thiab sludge. Cov khoom siv tsis yog catalytic rau acid-hydrocarbon cov tshuaj tiv thaiv. Nws tsis tso cov hlau ions uas tuaj yeem cuam tshuam cov txheej txheem alkylation. Lub PTFE exchanger muab cov tshuaj tsis muaj zog rau cov txheej txheem uas tsis xav tau catalysis tuaj yeem cuam tshuam cov khoom zoo.

Xaus
PTFE heat exchangers yog siv rau cua sov sulfuric acid catalyst slurry nyob rau hauv alkylation units thiab muab kev pab zoo tshaj los ntawm kev txo qhov yaig -corrosion synergy uas txhawb hlau poob hauv metallic exchangers. Lub chemically inert nto tsis muaj txheej txheej ntawm cov khoom siv corrosion kom degrade. Uas du, qis -zog nto tiv thaiv kev txuas ntawm cov sludge. Lub neej ua haujlwm ntawm 15+ xyoo piv rau 2-5 xyoo rau Hastelloy C-276. Yog li ntawd, qhov qis dua hloov zaus thiab txhim khu kev qha tshav kub kis tau tus mob ua rau PTFE qhov kev xaiv zoo dua rau kev lag luam alkylation acid.

Kev pabcuam engineering rau PTFE cov khoom siv hluav taws xob sib txawv hauv kev siv alkylation thiab acid sludge yog muab nrog kev xa cov kua qaub, cov ntsiab lus sludge, kev khiav hauj lwm kub thiab cov khoom siv tam sim no.