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Para-Xylene by Three-Stage Crystallisation from Xylene
Charlie

Imeundwa na

Charlie

19. Oktoba 2026DE
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Para-Xylene by Three-Stage Crystallisation from Xylene

Para-xylene melts at 15 °C (Lunge, 1887), so it crystallises out of mixed xylene when this is chilled hard. This is Talbot's three-stage process (US 2,985,694, 1961): chill the dry feed to about −95 °F and spin off the crystals, then warm them in stages in their own recycled liquor and spin again, until they are 98.5 % para-xylene. Para-xylene is the raw material for terephthalic acid and so for PET. The picture: our diagram of the three stages.
Juu
1 day

Maagizo

1

Take out the ortho-xylene (preferred)

If you can, first distil off ortho-xylene as the bottoms of a tall column: more than 35, better about 60, theoretical plates. The patent prefers this but does not require it.

Vifaa kwa hatua hii:

ZailiniZailini1 as required

Zana zinazohitajika:

Mkusanyiko wa nguzo ya kunerekaMkusanyiko wa nguzo ya kunereka
Boila ya mvukeBoila ya mvuke
Kipimajoto cha maabaraKipimajoto cha maabara
2

Dry the feed and add a little methanol

Remove all water from the xylene (calcium chloride is our choice of drier). Add methanol so ice does not plug the cold equipment: the patent's example uses 49 lb methanol to 13,430 lb feed.

Zana zinazohitajika:

Kloridi ya kalsiamuKloridi ya kalsiamu
MethanoliMethanoli
Tangi la kufanya fuweleTangi la kufanya fuwele
3

Chill to about −95 °F and spin

Cool slowly, over about 20 minutes, to between −75 and −120 °F (−59 to −84 °C); the example uses −95 °F (−71 °C). Spin the slurry in a centrifuge: the liquid (about 8 % para) goes out, the crystals are about 74 % para-xylene.

Zana zinazohitajika:

Kikristalishaji kilichopozwaKikristalishaji kilichopozwa
Sentrifyuji ya kikapuSentrifyuji ya kikapu
Kipimajoto cha maabaraKipimajoto cha maabara
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
4

Reslurry, bring to −30 °F, spin

Stir the crystals into the liquid from the next stage and bring the slurry to between 0 and −30 °F (−18 to −34 °C); the example uses −30 °F. Centrifuge again: the crystals are now about 91 % para-xylene.

Zana zinazohitajika:

Tangi la kufanya fuweleTangi la kufanya fuwele
Kikristalishaji kilichopozwaKikristalishaji kilichopozwa
Sentrifyuji ya kikapuSentrifyuji ya kikapu
Kipimajoto cha maabaraKipimajoto cha maabara
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
5

Reslurry warmer, spin and melt

Stir these crystals into the liquid from the last spin and bring to 10–45 °F (−12 to 7 °C). Centrifuge: the crystals are 98.5 % para-xylene. Melt them and bottle. Return the liquids to the earlier stages.

Zana zinazohitajika:

Tangi la kufanya fuweleTangi la kufanya fuwele
Kikristalishaji kilichopozwaKikristalishaji kilichopozwa
Sentrifyuji ya kikapuSentrifyuji ya kikapu
Kipimajoto cha maabaraKipimajoto cha maabara
Chupa za kioo zenye viziboChupa za kioo zenye vizibo

Vifaa

1
  • 1
    Zailini
    1 as required
    Kishikilia Nafasi

Zana Zinazohitajika

11

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Para-zailini

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Xylene from Coal-Tar Light Oil: the 137.5–142 °C Cut
Hatari

Xylene from Coal-Tar Light Oil: the 137.5–142 °C Cut

na CharlieDE

Viwandani

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