DE1493023A1 - Process for the extraction and purification of acrylonitrile - Google Patents

Description

dr. W. Schalk dipl.-inc. Peter Wirth

DIPL.-ING.G. E.M.DANNENBERG DR. V. SCH M I E D-KOWARZI K

6 FRANKFURT AM MAIN

CR. EaCHENHIIMHR ST «. 39 - PO STSC H EC KO NTO. 1969t FR AN K FU RT / M Al N

Sooiete d'Eleotrochlmie. d * Elect roste tallurgie et des Aoieries Eleotri ^ ues d'ügine 10, Bue du General Joy

Pari «YIII. France

Process for the Extraction and Purification of Acrylonitrile The present invention relates to the extraction and purification of τοη acrylonitrile from gaseous acrylonitrile-containing mixtures.

Process for the production of acrylonitrile, in particular the reaction of propylene, ammonia and molecular oxygen in the vapor phase at elevated temperature in the presence of an oxidation! catalyst *, are started In this process, the gases leaving the reaction vessel are usually treated with an acid solution, 2 B. a sulfur aura solution, at temperatures above washed, and eliminate the excess ammonia au before i the gases are subjected to a process for the extraction of the acrylonitrile. For the purpose of this separation is suggested been to cool the gases and wash them with water to remove acrylonitrile, The hydrogen cyanide formed and certain by-products, such as saturated or unsaturated carbon compounds, can be absorbed. The aqueous solution from this wash is distilled} the distillate is condensed and results in an organic fraction. The phase obtained at the Fuji of the column is partly used

909829 / U6A

BATHROOM ORiGINAL,

faaohkoloaa · smruokgefuhrt mad part «·!» · ellalerted. li » VUt dl · organises * fraction in the Om Bust aod» 1 «welehea · 1 · eieh *« fladet mnd / oderaaoht si · leioht alkaline, ma di · reaction Bwlaohea the hydrogen cyanide wad the carboxyl compounds enter BllAaag Ton Oyanh / drlnen m bofclJdNMU Iaek 8t »» ilt »i« rmaf di «« «r Oja * fcydriftt, di · alttAB higher 8i« 4 «paakt hooks, by soy ·· an acid, ^ emptyohiiaalcevyierylnltril uad / Cyanwaaaeratoft are often removed. The eo separated cyanh / drine, lnabeeooiere carrion oyanh / drln from aorollels "can" thus "become" reception vessels; daa Seetillat from larjlnltril can be aneahlleflena • enentallB »s« B. dmreh 9aatillatieaa ₉ g * r «inlft. Έ » « ari · feetgeetellt, dai la Terlauf der Beinigeng O / anvaaaeretoff «at 41 · materials containing carbon / oil groups are calibrated to form the Ojanhjrdrine Tereinlgen» as soon as al · glelohaeltlg la is flü · own Ima ·· aav «nend« lad. Saher eatattlt dl · wäearige LOaung au · der Waaehatufe O / anhydrlne, τοη which sloh some la Terlauf of the strips SestlUatlea alloht old of the organic fraction separate but sloh la watery Bodeaproduwkt are. 91 · Oewlanmag dleees Oyanh / drlna ans de «Bodenproduct 1st nleht wlrtsohaTtlloh. Therefore, the formation of oyanhydrins before their desired formation la the organic fraction and your Ilininiereng la product a loss of cyanide, in particular the oyanhydrins ▼ on aeroIein, in the preparation of aoryl nitrile.

909829 / U6A

ORIGINAL

01 · TWrtlegeade Brfladaag see si oh avf «In Yerfahrea aewlnaaag and lwlaigBwg τοη acrylonitrile on a gaseous KIeOiIiKBg ₉ AiM practically free τοη aaaoniak let, but · aebon« aebon acrylonitrile is still saturated or unsaturated hydrogen cyanide - ■ βlohnet, Aafi BMA dl · gaseous Hleoknae ateühlt, Al «a» g «kUblt · ■ iaolmiig alt Va * a« r Bvaok »absorption τοη AeryIaItrl 1, Oyaawa« e «r> • toff« md g * a & ttlgt «n or «ag« ettttlgtan O «rl> o & yl« räpajmt «a wtaoht, wob ·! When cooling down to Al absorption takes place, the pl-Vert of the flüoelgoa rluuio "ater" is kept for about 5, whereupon Al "wäearlge lOemag" detiles the Abeorptloa and a de-distillate is obtained, since acrylonitrile, Oyanwaaeeratoff " ad saturated uad aageeättlgt “carbonyl compounds” nthat whataaf dl · Qarbeoyi Terbiadaagen uad Aar Cyaawaaseretoff uater formation τοη Oyanaydrlaea la Aar liquid, whose condensation of the distillate ·· obtained rna ·· uaj “* etBt, where d» r dl «aor flUoelgaa Ria ·· oator otwa 4 is content, bi · dl · reaction boonAot let. Then nan dl · ·· f lüaslg · Pkaae wnr Abtrenmuag the OyanayArla · τοη Aorylnitrll and Uborsoauaaigoa Oyaawasseratoff a distillation, whereby the pH of this flüaeigan Ihaa · is kept at 4 during the distillation.

The present invention is based on the leststelluBg, Aai AIo the speed of the reaction τοη hydrogen cyanide alt Aon OarbenylTerbinduagen, especially with Aorololn and others, at dar Production of τοη aoryl nitrile from propylene, anaoaiac and laxative al «!« bonprodttkt · obtained carbonylT «rbindangon, decreases with decreasing pH value. The day of the act is on

909829 / U6A

BAD ORIQiNAL

U93023

tiui ja - »« * anger 4 ·· ** e «* iag« nt «* T« r «%» m 5 «1 · 1Α HOI» Λ * · 41 · «·· fsvat £ * t

lmr tfeai * a «* ti« a 4 * · g ** iörei * «* Β ·« ** 1α & · 9το4 **% · * wet pa-f «rt« fct «r *» * 5> «fla4et . Mm «lüttqpwf. · Ητ # 1 # 1ι * «a» 1 · 1 «& §» lnittt a * m τβι- lifts * 4 «r ton <wtl <w Ia Ιμ **« *** · »itxva« Um t «« r «Elmeprlt **« tor «ijwipräk *. S «ii

fcuta 4 «· ffr4T« rt At »la Mr A ¥ sonrti« »« t «for · rwr-

91 «i g

** m mrfiMiM * gßg * mMM · WmrtaMrmn mat Umtimxea ^ «at

tie * «em lF * irl * a ₉ liai« afilr aaA aaiiiini! «*« * t * a «r» toff

ait ftiok »t« ff, s «t« mt «ff _# * aa <m1« ir «ad r« «tll« 2t * a _# v «nMhJ,« 4 »a · Cfmr * oBjrlv« rtiadeaae «Ä waft £ »Eörmlf · eatMAlt,« ir «w practi ·· * TolletÄmdif« Zatf «nuo« Am

1i «haA« * according to Basa * & mH% an alt * ·! · Setar «f # l« ämr «Wl · 1α · γ f« ap «r * t« jr ttWr 86 * Im «la ·» Itaaer (t) dwreh llaeprüii · «Al« «« R Ματ ·. B «r« «a *» »för» ieem Streoi ait «l« «ftigt * Sfttixvaatsil is sufficient axm» va 4 «a pH value 4 * r £ 6a« a <aa «diwer toad« n «» tioii uad « iaer «oeätalich« a Wfceeb «sit» «» ir ami oat «· 3« «··· * · &. 91 «dl« Iuuir (1) T «rla *» # n4 «m 0» sw «r4« i la «iae tühlTorrlolitwMr (2) led,« βis »tell-Cond« tt «« tiQa «xXol * ** 91 · · Γίι »1ΐ · β · η β & β« are added to 90 9 8297 MtBU

SAD ORIGIN ^^ '^ ΟΛί?

ta ei »* f aa» ^ «rrl * at * ag (>) fftl« it «tt w ·« 1 «1» la * plf «s 1Λ * νΑ * au · frieeh ·· fj · *» ** an »4 ·» l * tat «a Beatillatioasetitf · * · τ4 ·». f · β · * · η · Α * all · let 41 ··· Waaoaflüaalt-1 »41 · Ya« efiir »rrittiitB» c »14

in * a

w «eer * tefr mm4

contains · »* · (4) Im« in ·

»Raictlce

· Lia f »U 41 ··· γ iä« «a« wir4 * «* §k 4 * r WaacfeTorrlebtoaj (3) «urüek ^ e leads

(7) x 11 «1α1 x γ%. M * oreaaito la «la I« aktl9 & afafia (8) slides wx4 «tab *» s «laaa« a.

mim wftasrlf *

(S)

Bi ··· »l» aic | l «wi« ailMI viz «f * fft * ftft« sfalia * ia alkallaak ·· «ucatUct» ι »41 · liXdwn« 4 * ir Cyanta / arla · «κ ¥ eaekl« tt ] il «« B · Dl · aaa Cyaahycrln «atliaateM · Miecaaag wlr4 caaa la« la 8ta * iU »ia r« ae «f« ä « i $ \ « •! • itat »la 4« a 4 «r pH- W * jrl der Hl «ok% a« 4βτοΑ Xuga »· T <w tier · aaf uat« r 4 «ia ^ atellt wir4. Xu 4i «a« a X «*« c as Sim «g *« ig »« t »lad ea 8ulfoa * 4ttr« | aB, ytelmeleulf · »- • äar ·. 91 · 4m etahilialert * Oyaob / drlÄ · »thaitea * · mi * & im « is * KeloÄ »· (10) gefüart, where tt» «r» eaüaeif ·· «Ad Oyaawaaa« r * t · «aa Koj ^ f dur ^ k L «it« ag (11) * atf * mt 91 «Oyaab / dari» wer4 «aa» Bod »a dujroa I * it» af (12) «ll» ial «rt. Sai 4aa Aorylaltril «attialteaA · B« * tlllat kaam 4aaa ι · 1 · 4uroa fraJt *

909829 / H64

iAD

4mm

for * w # r * · * köam «.

909829 / U64

BATH ORIGINAL

Claims (2)

ψ * * "at λ m m ψ r ft · k. » 1, - T «i ** br« a ear tfft & usamg Bad l * lni * a & f I »Aerylaitrll« t »« a · - ■ leaa «& g« a, 41 · aooh SyaÄW * Ji »* retoff, saturated · uad« a- Ca »» oaylT »rbiad« i «» n, iJMioaiak «zU nlefat kea4eaei» rt * aleht wmeeerlöelioh · Ca »·« ntfealten, 1 * 1 a · * * »« r «t taaai • atf * r» t _m $ * A ma wuta Ateöalwm dar fa »formi *« a Miealua »« di «·· alt V« §MHf f »wa» «h» n wl? A _t woWi ama «ia · wäewrlf« £ ΰ · «η« toä aajfl »itltrll * 0 |> iiwiPTtttiff imd earfcaogrlv (urfeia4aag« & «Aalt» Ai · »· 4 #« tilli «rt wir * uad das Erkaltea *, AerylaltPil» 4oa «i« rfc becomes, before aaa Al «BllAmaf τοπ Gyanfeydrinen aaA C ^ faiMMUia «r» todnf! «works _f w «ale * r al * 9 aalt. 2.- Twrfmfarwi sa «a «« • α 4 * r lllimac 4 «r Cjaaaya ^ la« «mi |» -4F «rt €« r IiMfIlM eat * IMmmg * «t» waii # T al «4 aaeh la »prueh. t _y aaiaroh c * k * «as« ieiia «t _v AaS di ··· £ 5e« ag% · 1 · 1β · »pI-W« rt matav 4 Iat «ataawalts .909829 / U64
BATH ORIGINAL ok Blank page