Öz
Bu çalışmada, CMSMPR (sürekli-karıştırmalı, sürekli-ürün çekmeli) tipi kristalizörde, saf
ortamda üretilen borik asit ve boraks pentahidrat kristallerinin su alma
yeteneği, kekleşme derecesi tayini, ve mekanik dayanım, kekleşme, kırma
testleri yapılmıştır. CMSMPR sisteminde üretilen hem borik asit hem de
boraks pentahidrat kristallerinin su alma yeteneği, kekleşme, aşınma derecelerinin
yüksek olduğu ve bu kristallerin nemden oldukça etkilendiği ve bu nedenle habitinde
bozulmalar meydana geldiği görülmüştür. Ayrıca, kekleşme ve kırma testleri
sonucunda belirlenen akışkanlık durumları değerlendirildiğinde ise borik asit
kristallerinin kohezif (yapışan), boraks pentahidrat kristallerinin ise çok
kohezif olduğu tespit edilmiştir. Tüm bu sonuçlar esas alındığında, kekleşmeyi
önlemek için borik asit ve boraks pentahidrat kristallerinin yüksek nem oranlarına
maruz kalmaması gerektiği görülmektedir.
Anahtar Kelimeler
Kaynakça
- Johanson J.R, Paul B.O. 1996. Eliminating Caking Problems, Chemical Processing, 59 (8): 71-75.
- Schmitt L.C. 1963. Production of a Non-Caking Borax, U.S.A patent No. 3, 109, 705.
- Fitzpatrick J.J., Hodnett M, Twomey M, Cerqueira P.S.M., O'Flynn J, Roos Y.H. 2007. Glass Transition and the Flowability and Caking of Powders Containing Amorphous Lactose, Powder Technology, 178 (2): 119-128.
- Mullin J.W. 2001. Crystallization, Butterworth-Heinemann: London.
- Subaşı N. 2014. Boraks Dekahidratın Kekleşmesinin Önlenmesi, İstanbul Teknik Üniversitesi Fen Bilimleri Enstitüsü: İstanbul.
- Göcen Ü. 2010. Boraks Dekahidratın Kristalizasyon Özelliklerinin İncelenmesi, İstanbul Teknik Üniversitesi Fen Bilimleri Enstitüsü: İstanbul.
- Cleaver J.A.S., Karatzas G, Louis S, Hayati I. 2004. Moisture-Induced Caking of Boric Acid Powder, Powder Technology, 146 (1): 93-101.
- GEA. 2016. Analytical Methods Dry Milk Products. GEA Niro Analytical Methods, Method A 14 a - Hygroscopicity Soeborg: GEA Niro Research Laborator, [Available from: http://www.gea.com/en/binaries/A%2014%20a%20-%20Hygroscopicity_tcm11-30922.pdf.
- GEA. 2016. Analytical Methods Dry Milk Products. GEA Niro Analytical Methods, Method A 15 a - Degree of Caking Soeborg: GEA Niro Research Laborator, [Available from: http://www.gea.com/en/binaries/A%2015%20a%20-%20Degree%20of%20Caking_tcm11-30923.pdf.
- GEA. 2016. Analytical Methods Dry Milk Products. GEA Niro Analytical Methods, Method A 1 c - Free Moisture Soeborg: GEA Niro Research Laborator, [Available from: http://www.gea.com/en/binaries/A%201%20c%20-%20Free%20Moisture_tcm11-30902.pdf.
- Myerson A.S. 1981. Determination of Degree of Attrition of Sodium Perborates, Handbook of Industrial Crystallization, British Standards Institution, p. 5688.
- Schulze D. 2001. Flow Properties of Powders and Bulk Solids and Silo Design for Flow, Produktbroschüre, Internationaler Kongress für Partikeltechnologie Powtech, 27-29 March, Partec Nürnberg.
Öz
In this study, the determination of hygroscopicity and the caking
degree, and the tests of mechanical strength, caking, breaking of boric acid
and borax pentahydrate crystals produced in pure medium in the CMSMPR (Continuous Mixed-Suspension, Mixed-Product Removal) type crystallizer were performed. Both the
boric acid and borax pentahydrate crystals produced in the CMSMPR system were
found to have high hygroscopicity, degrees of caking and attrition, and these
crystals were highly influenced by moisture and thus deteriorated their habit. Furthermore,
when the fluidity conditions determined as a result of caking and breaking
tests were evaluated, it was found that boric acid crystals were cohesive and
borax pentahydrate crystals were very cohesive. Based on these results, it is
seen that boric acid and borax pentahydrate crystals should not be exposed to
high humidity in order to avoid caking.
Anahtar Kelimeler
Kaynakça
- Johanson J.R, Paul B.O. 1996. Eliminating Caking Problems, Chemical Processing, 59 (8): 71-75.
- Schmitt L.C. 1963. Production of a Non-Caking Borax, U.S.A patent No. 3, 109, 705.
- Fitzpatrick J.J., Hodnett M, Twomey M, Cerqueira P.S.M., O'Flynn J, Roos Y.H. 2007. Glass Transition and the Flowability and Caking of Powders Containing Amorphous Lactose, Powder Technology, 178 (2): 119-128.
- Mullin J.W. 2001. Crystallization, Butterworth-Heinemann: London.
- Subaşı N. 2014. Boraks Dekahidratın Kekleşmesinin Önlenmesi, İstanbul Teknik Üniversitesi Fen Bilimleri Enstitüsü: İstanbul.
- Göcen Ü. 2010. Boraks Dekahidratın Kristalizasyon Özelliklerinin İncelenmesi, İstanbul Teknik Üniversitesi Fen Bilimleri Enstitüsü: İstanbul.
- Cleaver J.A.S., Karatzas G, Louis S, Hayati I. 2004. Moisture-Induced Caking of Boric Acid Powder, Powder Technology, 146 (1): 93-101.
- GEA. 2016. Analytical Methods Dry Milk Products. GEA Niro Analytical Methods, Method A 14 a - Hygroscopicity Soeborg: GEA Niro Research Laborator, [Available from: http://www.gea.com/en/binaries/A%2014%20a%20-%20Hygroscopicity_tcm11-30922.pdf.
- GEA. 2016. Analytical Methods Dry Milk Products. GEA Niro Analytical Methods, Method A 15 a - Degree of Caking Soeborg: GEA Niro Research Laborator, [Available from: http://www.gea.com/en/binaries/A%2015%20a%20-%20Degree%20of%20Caking_tcm11-30923.pdf.
- GEA. 2016. Analytical Methods Dry Milk Products. GEA Niro Analytical Methods, Method A 1 c - Free Moisture Soeborg: GEA Niro Research Laborator, [Available from: http://www.gea.com/en/binaries/A%201%20c%20-%20Free%20Moisture_tcm11-30902.pdf.
- Myerson A.S. 1981. Determination of Degree of Attrition of Sodium Perborates, Handbook of Industrial Crystallization, British Standards Institution, p. 5688.
- Schulze D. 2001. Flow Properties of Powders and Bulk Solids and Silo Design for Flow, Produktbroschüre, Internationaler Kongress für Partikeltechnologie Powtech, 27-29 March, Partec Nürnberg.
Ayrıntılar
| Birincil Dil | Türkçe |
|---|---|
| Bölüm | Araştırma Makalesi |
| Yazarlar | |
| Yayımlanma Tarihi | 26 Eylül 2020 |
| Gönderilme Tarihi | 10 Ekim 2019 |
| Kabul Tarihi | 8 Nisan 2020 |
| Yayımlandığı Sayı | Yıl 2020 |