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Extruded Polystyrene Foam: Propylene-Blown Log Let Out at 50 °C (McIntire, Dow 1948, Ex. 3, Test 2)
Charlie

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Charlie

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Extruded Polystyrene Foam: Propylene-Blown Log Let Out at 50 °C (McIntire, Dow 1948, Ex. 3, Test 2)

Extruded polystyrene foam blown with a propylene gas fraction instead of methyl chloride. Polystyrene stands two days at 40 °C with the propylene under pressure and becomes a gel. Let out at 50 °C (250 psi in the tower), it swelled into a log 6 to 9 inches across, weighing 4.8 lb per cubic foot, with somewhat smaller, uniform cells. Source: O. R. McIntire (Dow), US 2,450,436 (1948), Example 3. Picture: the patent's drawing.
Osezingeni eliphezulu
3 days

Imiyalelo

1

Charge the tower with polystyrene

Charge a high-pressure tower with 300 lb of granular polystyrene.

Izinto zokwakha zalesi sinyathelo:

I-PolystyreneI-Polystyrene300 lbs

Amathuluzi adingekayo:

I-reactor yengcindeziI-reactor yengcindezi
Isikali sesilinganisoIsikali sesilinganiso
Amagilavu erabhaAmagilavu erabha
2

Add the propylene fraction

Add 100 lb of a cracked-oil gas fraction that is about 93 % propylene, under pressure, and close the tower. Propylene is a flammable gas: no flames, strong ventilation.

Izinto zokwakha zalesi sinyathelo:

I-propyleneI-propylene100 lbs

Amathuluzi adingekayo:

Isilinda segesi ecindezelweIsilinda segesi ecindezelwe
I-reactor yengcindeziI-reactor yengcindezi
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
3

Stand two days at 40 °C

Let the tower stand for two days at 40 °C while the polystyrene takes up the propylene.

Amathuluzi adingekayo:

I-reactor yengcindeziI-reactor yengcindezi
Ithemomitha YaselabhorethriIthemomitha Yaselabhorethri
4

Let it out at 50 °C

Open the valved outlet near the bottom (3.25 inch in the patent) at 50 °C. The pressure is about 250 psi. The gel flows out and swells into a log 6 to 9 inches across, 4.8 lb per cubic foot, with somewhat smaller, uniform cells. Close the outlet again. The patent heated step by step (50, 60, 75 °C) for several hours each, letting a portion out at each step.

Amathuluzi adingekayo:

I-reactor yengcindeziI-reactor yengcindezi
Ithemomitha YaselabhorethriIthemomitha Yaselabhorethri
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
5

Saw into boards

When the foam has set, saw it lengthwise into slabs (ours: a woodworking saw).

Amathuluzi adingekayo:

Isaha lombaziIsaha lombazi
Amagilavu erabhaAmagilavu erabha

Izinto

2

Amathuluzi Adingekayo

7

Le blueprint yenza

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Isibambeli

Ibhodi legwebu le-polystyrene elicindezelwe

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Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Extruded Polystyrene Foam Board: Polystyrene Swollen with Methyl Chloride and Let Out below 130 °C
Yingozi

Extruded Polystyrene Foam Board: Polystyrene Swollen with Methyl Chloride and Let Out below 130 °C

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Kwezimboni

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Ethylene by Steam Cracking of Naphtha

Ethylene by Steam Cracking of Naphtha

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Kwezimboni

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