Nickel Insitute - Nickel Alloys in Organic Acids & Related Compounds

TABLE LXXIX

TABLE LXXXI

Corrosion of Alloys in Ethyl Acrylate Synthesis

Corrosion of Alloys in Ethyl Acrylate Preparation from Acetylene

Conditions: Specimens exposed in an ethyl acrylate

reactor for 74 days at a temperature 110 ºC (230 ºF) with sulfuric acid catalyst.

of

Conditions: Specimens exposed in the reaction kettle where acetylene, carbon monoxide, ethanol and nickel chloride were agitated heavily for 17 days. Acids formed were approximately 5% acrylic and 2.5% hydrochloricacid.

Corrosion Rate

Vapor Line from Reactor

Base of Reactor

Alloy

mm/y

mpy

mm/y

mpy

.89 .25 .13 .13 .08 .03 .05 .08 .03 –

35 10

5.08 >10.16 .33 –

200 >400 13 – 8 20 –

Type 304 Stainless Steel Type 316 Stainless Steel

Corrosion Rate

5 5 3

CARPENTER alloy 20 HASTELLOY alloy G HASTELLOY alloy C HASTELLOY alloy B HASTELLOY alloy D INCONEL alloy 600 MONEL alloy 400 Nickel 200 Copper Titanium Zirconium

Alloy

mm/y

mpy

1.27 .33 .08 .05 .25 2.03

50 13

Type 316 Stainless Steel CARPENTER alloy 20 HASTELLOY alloy C-276 HASTELLOY alloy B Nickel 200 MONEL alloy 400

.20 .51

1

3 2

2 3

–

.91 .58 .63 1.14

36 23 25 45

10 80

1 – 1 21 <1

Copper

3.30

130

.03 .53 <.03

– –

– –

TABLE LXXX

Corrosion of Alloys in Higher Acrylate Esters Production

Conditions: Exposure in base of reactor processing higher acrylates at 110-160 ºC (230-320 ºF) shown. Sulfuric acid catalyst used. for times

Butyl 67 days

Octyl 11 days

Decyl 11 days

Corrosion Rate

Alloy

mm/y

mpy

mm/y

mpy

mm/y

mpy

10.16

400

>38.1

>1500

Type 316 Stainless Steel

3.63-5.49

143-216

1.78

70

1.27

50

CARPENTER alloy 20 INCOLOY alloy 825 HASTELLOY alloy G HASTELLOY alloy C HASTELLOY alloy B HASTELLOY alloy D INCONEL alloy 600

.13-.58

5-23

– –

– –

– –

– –

.61 .10

24

4

1.02

40

.76

30

.08-.61 .15-.28

3-24 6-11

– –

– –

– –

– –

.08

3

2.79

110

1.90

75

.66-1.24 .18-.25

26-49

– – – –

– – – –

– – –

– –

MONEL alloy 400

7-10

.03

1

DURIRON

–

Titanium Zirconium

.08-.13 .03-.05

3- 5 1- 2

<.03

<1

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