rangkuman singkat tentang kristalisasi & rekristalisasi
tugas hetero IIFull description
Full description
prinsip dasar kristalisasiFull description
Deskripsi lengkap
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KRISTALISASI
What is the size of a nucleus of a sugar crystal in equilibrium at 20°C with mother liquor at 115% supersaturaon !he surface tension at the crystal"liqui# interphase is esmate# to be 0$00 &'m 2$ !he #ensity of the sugar crystal is 1(00 )g'm $ *i)et *i)et + ,olecular ,olecular weigh weightt of sucrosesucrose- , . /2 )g')gmol . 115 % . 0$00 &'m2 ! . 20°C . 2 3 !anya + 4 &awab + .
M . ρ
342 1600
. 0$2165 m')gmol
7or sugar- n . 1 ln .
4 Vσ nRTL
ln 1$15 .
4 x 0.21375 x 0.003 1 x 8.314 x 293 x L
4 . 6$5 8 10"( m . 6$5 9m
: salt soluon weighing 10000 )g with 0 wt% ;a 2C< is coole# to 2 3 =20°C>$ !he salt crystaliizes as the #ecahy#rate$ #ecahy#rate$ What will be t he yiel# of ;a 2C<$10?2< crystals if the solubility is 21$5 )g anhy#rous ;a2C<'100 )g of total water *o this for the following cases$ a$ :ssum :ssume e that that no water water is e@a e@apor porat ate# e# b$ :ssume :ssume that % of the total total weight weight of the soluon soluon is lost lost by e@apora e@aporaon on of water water in cooling cooling
W )g ? 2<
7 10000 )g soluon 0 % ;a2C<
Cooler an# Crystallizer
A )g soluon 21$5 )g ;a 2C< ' 100 )g ?2<
C )g crystalscrystals- ;a2C<$10?2<
Aoluon + !he molecular weight are 10( for ;a2C<- 1B0$2 for 10?2<- an# 2B($2 for ;a 2C<$10?2<$
W being )g ?2< e@aporate#- A )g soluon =mother liquor>- an# C )g crystals of ;a2C<$10?2<$ ,a)ing a material balance aroun# the #ashe#"line bo8 for water for part =a>- where W . 0 0$60 =10000> . 0$0 =10000> .
100 100 + 21.5 21.5 100 + 21.5
=A> =A>
180.2 286.2 106.0 286.2
=C> 0 =W> =C> 0 =W>
DD =1> balance for water DD =2> balance for ;a2C<
Aol@ing the two equaons simultaneouslyC . D$ )g of ;a2C<$10?2< A . D$$ )g soluon 7or part =b>- W . 0$0 =10000> . 00 )g ?2<- equaon =1> becomes 0$60 =10000> .
0$0 =10000> .
100 100 + 21.5 21.5 100 + 21.5
=A>
=A>
Aol@ing the two equaons simultaneouslyC . D$$ )g of ;a2C<$10?2< A . D$$ )g soluon
