2-amino-2-methyl-1-propanol

2-amino-2-methyl-1-propanol
     

 

^†

  

305-701     373-1 (2003 4 15 , 2003 10 8 )

Study of Foam Stability of an Aqueous 2-amino-2-methyl-1-prpanol and Foamability of Various Aqeuous Amine Mixtures

Ho Byung Yoon and Won Hi Hong^†

Department of Chemical and Biomolecular Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea (Received 15 April 2003; accepted 8 October 2003)



oC 80^oC

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Abstract−Foam decay time of aqueous 2-amino-2-methyl-1-propanol mixture was studied experimentally at various tem- peratures between 20 and 80^oC. Foam stability mechanism was changed at 65^oC. For the purpose of analyss of these results we assume that the additional barrier of foam decay is proportional to operating temperature. We measure foamability at a var- ious operating temperature and amine concentrations in the aqueous diethanolamine, N-Methyldiethanolamine and 2-amino-2- methyl-1-propanol mixtures. The results showed that density, viscosity and surface tension play an important role in the foamability.

Key words: Foam Stability, Foamability

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†To whom correspondence should be addressed.

E-mail: whhong@kaist.ac.kr

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2-3.

2-3-1. 2-amino-2-methyl-1-propanol Lo ²t

AMP(2-amino-2-methyl-1-propanol) Lo ²t Shou [19]

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2-3-2. 2-amino-2-methyl-1-propanol Lo ±t

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¥

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Fig. 1. Experimental apparatus.

1. Test column 16. Air gas 2. Reference column 17. Pressure gauge

3. Glass frit 18. Pump

4. Amine/water solution 19. Flow meter

5. Circulator 10. Manometer Fig. 2. Densities of aqueous AMP solutions.

 41 6 2003 12

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 (foam stability) 

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8„ Q…T. 20^oCçè ?t "ÿ•ï '


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…+[, ?t : •ï ±*+ :(£T. ‰´0 ™š ? t 65^oC
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Q; Q… 
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?t :5 Š

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Q-< '

ÏQ Ö"# 3
R S+0, AMP Lo 2r5 ÚÌ ?t  : (µ “?t(È ™š5< 65^oC)
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?t "ÿ+ C7 ' ×
¾Q ¿"X '

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65^oC
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´7 5= 
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8„Q…T.

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(1)

(2)

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uT. ‰R τ mºc
uT.

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( z³5< 5=  z

!
–-< 'Ï°t& + 0ö  S+0, 65^oC
"

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" 

+ ¦¿•  –P uT.

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( ?t5< a‹ Ï°t + '


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× '
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---τ

 

  –

=

L t( ) at+b exp –Et ---τ

 

  –

= Fig. 3. Viscosities of aqueous AMP solutions.

Fig. 4. Foam decay time AMP 10 wt%+pip 1 wt%.

Fig. 5. A campare with two different decay mechanism (AMP 10 wt%+

pip 1 wt%).

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3-2.
 (foamability)  

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“foamability”k “foaminess” $
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6 ¢
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Fig. 75 diethanolamine(DEA) Lo5 67 ™š Á& 0ö†

…T.

 DEA 5, 10, 20 wt%5 67 ™š Á& 0ö†R S+[, as

?t :+ C%< ' t :( ƒ# ˜  ST.

Diethanolamine  õt :5 6%< 10 wt% “ §  ¢X 

# 0ö† ƒ# %  ST.
I 
as ?tI 6" i ? t ñ5 Šü Á diethanolamine Lo ‘ ñ5 Šü ƒ + %  ST. , diethanolamine Lo ²t, ±t, ¦;

X ‘¥ z!# < ' t& 0ö† æm ' 

¢
 ÁuT.

Fig. 8 9  N-Methyldiethanolamine(MDEA), 2-amino-2-methyl- 1-propanol(AMP) Lo ' t& as ?t5 Š‹< 0ö

ƒ
T. Fig. 7 diethanolamine ÁI 
as ?t : •

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 :  (T “ õt
ß5 ( Á& 3µ R ST.

Fig. 10X ™š5 eLu 3&l Tü i ‘C diethanolamine, N-methyldiethanol amine ‰R 2-amino-2-methyl-1-propanol õt :5 Šü ' t& 0ö†R S+[, as?t 50^oC “§

Á& 0ö†R ST.

3-2-1. ' t5 {} ²t z!

‘ ²t : •ï ' ×tI ' t 

λ ∆lnL

∆lnT

---−˜(L₁–L₀) T₁–T₀

( )

---

=

Fig. 6. Change of the rate of foam decay time according to the operat-

ing temperature. Fig. 7. An effect of operating temperature on the foamability (DEA/

Water).

Fig. 8. An effect of operating temperature on the foamability (MDEA/

Water).

 41 6 2003 12

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Fig. 105 as?t 50^oC “§ ‘ ²t ñ5 Šü '

t& 0ö†…T.
‰ +çè ' t5 {} ²t

z!
±t0 ¦; v5 ë%< —T ƒ# ˜  ST.

3-2-2. ' t5 {} ±t z!

i ‘ ±t : (P  ï ' t (P uT. ²t ' O#  ( ƒ Tü   ±t :

•ï ' # Â (P Q *, ¯ÕQ mnI ) on 

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: (P uT. , “7 ¯

°
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 ¥-Ú mn =R S ,5 67 on + 
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(P uT.
´

7 Áçè ±t :5 Šü ' t  (PuT.

™š Á5 0ö@ ƒZ as ?t : •ï i Lo

±t (P QR, ‘ õt : •ï i Lo ± t :(P uT(Fig. 3).
´7 ±t : z!+ “7 õt

"5< ' t ( -# 3
P Q ƒ
T.

Fig. 115 ±t ñ5 Šü ' t& 0ö†…T. ‘

±t :+ C%< ' t ( ƒ# ˜  ST.

3-2-3. ' t5 {} ¦; z!

' t5 z!#  ‘+  ¬P —L( ƒ+ ¦

;#  •  S+[, ¦; 
: •ï ' ×t (P uT.

as ?t : •ï i Lo ¦;X (P QR ' t : (P uT. ‰R i Lo i õt :  •ï ¦;X (P QR ' t : (P uT.

Fig. 125 ¦;5 7 ' t ñ& 0ö†…T. DEA

Lo 50, 60^oC5< Á& 0ö†…T.

Fig. 13X i õt :5 Š‹< ²tI ¦; 5 Š

ü z!5 %< ‚X i õt z³5< ' t :( 2!# 3
T i õt : •ï ±t z!
²tI ¦

; v& ".(µ ' t  u ƒ
T.

nf_ 2r OQ (
/ 0È ‘ ' O t&

Fig. 9. An effect of operting temperature on the foamability.

Fig. 10. Density effect on the initial foam height.

Fig. 11. Viscosity effect on the initial foam height.

Fig. 12. Surface tension effect on the initial foam height.

Reynolds I Weber 1+ 0ö  S+[  (4)Z 0ö 

 ST[24].

(4)

' t ³c  (4)I X MN+ 0ö  S+[, ' 

t& {( æm '  ¢
 ²t, ±t, ¦; X

‘ ‘5 Uë2( ƒ+çè  (5)I X 8# #

 ST.

(5)

 (5)5< æm '  ¢
5 {} ²t z!
±tI ¦

;5 ë%< —TR 7T; 7 8+ ²t z!# ¶ c •  STR 7T;  (5)5< ²t+# "  •  ST.

4.  

2-amino-2-methyl-1-propanol Lo ' ×t as ?t5

Š‹< ' Ï m> ñ7T ƒ# ™š# ›%< ˜P Q…T. ™

š?t 65^oC
(“ §5 ' Ï °t Î c5 6%<

ý*+ ([, ™š ?t : •ï ¨ ùúP Ï uT.

‰´0 ™š ?t 65^oC
"“ §5 
'
»== ŽR ×

u ' û
Ú3 c# êR 4J (P Q[, ' Ï °t ³ c Î c5 6%< ý*C -# 3
= Ž T.
4P ™š ? t :5 Š‹< ×u ' û
Q
¯ ™š ?t : 5 Š‹< ' Ï# M%( 5=  
:(m §À

T.
´7 5=  z!# 5I 
0ö   ST.

$5< 65^oC
( as?t5< 1.8-2.0(cm/s) ' Ï°t&

…R, 65^oC
" as?t5< 'Ï# M%( 5=

 # …+[ ‰ X (E/τ) 0.1207
uT.

“7 as a­(5< O  S ' Ö# 0ö† '

t as ?tI i Lo" i õt5 Š‹< Tü 

# 0ö† *, ' Ot5 z!# {} ‘+ ²t, ±t ‰

R ¦; 
S+[, ²t, ±t, ¦;  
: •

H_F : foam height H_i : initial foam height v_s : superficial velocity Re : reynolds number

We : weber number

 

α : experimental constant µ : viscosity

ρL : liquid density σ : surface tension



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---d A v²dρ ---σ

 

 ^0.55 dvρ ---µ

 

 ^0.115 We^0.55Re^0.115

= = =

H_i α ---ρ A

----ρ

  ^a B ----µ

  ^b

=

L t( ) at+b exp –Et ---τ

 

  –

=

Re dv_sρL ---µ

=

We v_s²dρL ---ρ

= Fig. 13. Foamability of amine/water mixtures (50^oC).

 41 6 2003 12

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