US2011212405A1PendingUtilityA1
Method for the production of ultrapure phosphorus by zone melting in a non-flammable environment, and the apparatus used in such method
Est. expiryFeb 12, 2030(~3.5 yrs left)· nominal 20-yr term from priority
Y02P20/10C01B 25/04
40
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Claims
Abstract
In general, the present invention relates to the production of ultrapure phosphorus. In particular, the present invention relates to the method for the production of ultrapure phosphorus by zone melting in a Non-flammable environment and the equipments used in such method. The process of the present invention is clean, chemical free, fast, and energy efficient.
Claims
exact text as granted — not AI-modified1 . A method of production of ultrapure phosphorus by zone melting in a non-flammable environment, comprising the steps of:
a. Fixing a heater in a non-flammable environment; b. Fixing a phosphorus bar through the heater; c. Setting up a motor to control the heater moving along the phosphorus bar; d. Heating a part of the said bar to become a heat zone e. Moving the heater along the said bar in order to have the meat zone moving with the heater; f. Repeat step e if necessary.
2 . The method of production of ultrapure phosphorus as mentioned in claim 1 , wherein the length of the heater D, the radius of the phosphorus bar R, the temperature of the heater T h , and the moving velocity of the heater v shall control the solutions of the following governing equations:
In r<R and 0<z<L,
1
M
∂
φ
∂
t
=
(
K
E
+
TK
S
)
∇
2
φ
-
1
2
(
W
E
+
TW
S
)
g
′
(
φ
)
+
L
V
(
T
-
T
M
)
T
M
p
′
(
φ
)
c
P
∂
T
∂
t
+
L
V
r
′
(
φ
)
∂
φ
∂
t
+
1
2
W
E
g
′
(
φ
)
∂
φ
∂
t
=
∇
·
[
k
(
φ
)
∇
T
]
+
K
E
∂
φ
∂
t
∇
2
φ
The boundary conditions are:
k
(
φ
)
∂
T
∂
n
=
h
(
T
h
-
T
)
,
for
v
·
t
≤
z
≤
v
·
t
+
D
and
r
=
R
,
k
(
φ
)
∂
T
∂
n
=
h
(
T
0
-
T
)
,
for
z
<
v
·
t
,
z
>
v
·
t
+
D
and
r
=
R
,
z
=
0
,
z
=
L
,
∂
φ
∂
n
=
0
,
for
r
=
R
,
z
=
0
,
z
=
L
;
In these equations, φ(x,t) is an continuous function which labels the two phases at the position x and the time t, with φ=0 in the solid phase, φ=1 in the liquid phase and 0<0<1 in the interfacial region; M is the mobility coefficient, K E and K S are interfacial energy coefficients, W E and W S are barrier heights for double well potential function g(φ)=φ 2 (1−φ) 2 ; p(φ)=φ 2 (3−2φ); L V ; is the latent heat per unit volume and T M is the melting point; T(x,t) is the temperature distribution at the position x and the time t; c p , is the heat capacity per unit volume, r(φ)=p(φ); k(φ) permits different thermal conductivities k L =k(0) and k S =k(1) in the bulk liquid and solid phases, respectively; these governing equations being solved on a cylindrical domain x=(z,r)ε[0,L]×[0,R], L is the length of phosphorus cylinder and R is the radius, z is the axial direction coordinate, r is the radial direction coordinate, D is the length of the heater, n is the outer normal vector of the boundary, h is the heat transfer coefficient, T 0 is the room temperature and T h is the temperature of the heater.
3 . The method of production of ultrapure phosphorus as mentioned in any one of the preceding claims, wherein the said phosphorus bar can be molded by a plastic mold, preferably a high density polyethylene or Teflon tube with a round hole in the middle.
4 . The method of production of ultrapure phosphorus as mentioned in any one of the preceding claims, where the length of the heater is at least 2 times, preferably at least 3 times, more preferably at least 4 times, longer than the diameter of the phosphorus bar.
5 . The method of production of ultrapure phosphorus as mentioned in any one of the preceding claims, wherein the temperature of heater is between 45° C. and 80° C.
6 . The method of production of ultrapure phosphorus as mentioned in any one of the preceding claims, wherein the temperature of heater is between 45° C. and 60° C.
7 . The method of production of ultrapure phosphorus as mentioned in any one of the preceding claims, wherein the temperature of heater is between 45° C. and 50° C.
8 . The method of production of ultrapure phosphorus as mentioned in any one of the preceding claims, wherein the velocity of the heater is between 0.02 mm/s and 0.1 mm/s.
9 . The method of production of ultrapure phosphorus as mentioned in any one of the preceding claims, wherein the velocity of the heater is between 0.05 mm/s and 0.1 mm/s.
10 . A apparatus for the production of ultrapure phosphorus as mentioned in the preceding claims, which comprises in a non-flammable environment:
g. heater; h. a phosphorus bar fixed through the heater and between fixing units; i. a motor set up to control the heater moving along the phosphorus bar.Join the waitlist — get patent alerts
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