Crystallization - 1st Edition - ISBN: 9781483230511, 9781483278001

Crystallization

1st Edition

Editors: Pieter Honig
eBook ISBN: 9781483278001
Imprint: Elsevier
Published Date: 1st January 1959
Page Count: 586
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Description

Principles of Sugar Technology, Volume II: Crystallization summarizes the principles of the crystallization process applied in the sugar industry all over the world.

This book describes the control systems and theories concerned with crystallization, reviewing the complicated technological process in sugar manufacture. The crystallography of sucrose in relation to the techniques, control methods, and fundamental changes and evolutions in the equipment used in factories for the crystallization process are also considered. Other topics include the developments in the technology as to crystallization by cooling, solubility of sucrose in impure solutions, and control instruments and technological and engineering developments in vacuum control and adjustment. The regulation of vapor pressures, significance of the circulation in vacuum pans, and nucleation technique are also covered in this publication.

This volume is valuable to sugar technologists and individuals connected with the sugar industry.

Table of Contents


Preface

1. Crystallography of Sucrose

1. Introduction

2. Characterization of a Crystal

3 . History of and Introduction to Crystallography

a. The Morphology of Crystals

b. The Symmetry of Crystals

c. Indexing of Crystal Faces

4. Crystallography of Sucrose

a. Crystallographic Zones

b. The Stereographic Projection

5 . Forms of Sucrose Crystals

6. Physical Properties and Internal Structure of Sucrose Crystals

7. Distribution of Impurities in Sucrose Crystals

8. Crystallographic Comments Upon Cane Raw and Refined Sugars

a. RaW

b. Refined

9. Particle Sizes of Granulated and Raw Sugars

10. Determination of M.A. and C.V.

Bibliography

2. The Solubility of Sucrose in Impure Solutions

1. Introduction

2. Solubility Determination

3. Three Component Sucrose Solutions

4. Multi-Component Sucrose Solutions

5. Sucrose Double Compound Formation

6. The Phase Rule and Phase Equilibrium Diagrams

7. Ternary Systems with Two Liquid Phase Solutes

Bibliography

3. Nucleation in Supersaturated Sucrose Solutions

1. Introduction

2. General. Nucleation and Growth

3. Nucleation Theory as Applied to Sugar Solutions

a. Supersolubility

b. Modern Theory

4. Experimental Methods and Results

a. Nucleation Experiments

b. Impurities

c. Foreign Particles

d. False Grain

e. Graining Particles

Bibliography

4. Kinetics of Crystallization Growth of Crystals

1. Introduction

2. Methods

a. General

b. Rate of Growth by Measurement of the Crystal

c. Rate of Growth by Measurement of the Solution

d. Experimental Variables

3. Rate of Growth in Pure Solutions

a. Concentration

b. Temperatures

c. Stirring

d. Mechanism of growth

4. Impurities

a. General

b. Activity Theory

c. Factory Work

5. Dissolution

Bibliography

5. Chemistry of Crystallization

1. Introduction

2. Decomposition of Sucrose During the Crystallization Process

3. Decomposition of Reducing Sugars

4. Reactions of Organic Nonsugars

5. Phenomena Related with the Different Types of Inorganic Nonsugars

a. How is the Presence of Inorganic Suspended Solids Demonstrated in Commercial Sugars?

b. Different Methods of Determining the Amount of Insoluble Nonsugars in Molasses and C-Sugars

6. Nonsugars Affecting the Crystallization of Sugars

7. Phenomena Related with the Dissolution and Regrowth of Sucrose Crystals

8. Effect of Precipitated Nonsugars on the Purity of Centrifuged Sugar

Bibliography

6. Control Methods and Equipment in Sugar Crystallization

1. Introduction

2. Development of Control Methods

3. Importance of Control Equipment

4. Basic Data and Definitions

a. Solubility of Pure Sucrose

b. Solubility of Impure Sugar Solutions

c. Saturation Coefficient

d. Boiling Point Elevation - Pure Sucrose Solutions

e. Boiling Point Elevation - Impure Sugar Solutions

f. Supersaturation - Pure Sucrose Solutions

g. Supersaturation - Impure Sugar Solutions

5. Pan Control Equipment

a. Control of Absolute Pressure

b. Measurement of Boiling Point Elevation

c. Indication and Measurement of Supersaturation

d. Measurement of Fluidity

e. Measurement of Massecuite Level

6. Automatic Control Equipment

7. Summary

Bibliography

7. Application of the Conductivity Method to Control the Crystallization Process and Seeding Technique

1. Introduction

2. The Use of the Cuitometer as Operational Control Instrument

a. The Judgment of the Pan Boiler

b. Viscosity and Conductivity

c. Specific Conductance of Sugar Solutions

d. Mathematical Relation of Viscosity and Conductance

e. Supersaturation, Viscosity and Conductance

f. Conductance and Technical Sugar Crystallization

g. Electrode Cells in Technical Conductivity Control

h. Magnitude of Conductance in Technical Raw Sugar Crystallization

i. Commercial Conductivity Control Equipment

j. Application of Conductivity Control in Different Countries

k. Application of Conductivity Determinations on the Pan Floor

l. Recorded Conductivity Charts of Boilings in Cane Sugar Mills

m. Modification of the Conductivity Control Method

3. Graining of Low Grade Boilings in Raw Sugar Mills

a. Graining of Low Grade Boilings with Powdered Sugar

b. What Kind of Powdered Sugar Should be Used?

c. The Use of Fondant Sugar as Primary Seed for Low Grade Boilings

d. Standard Technique for Making a Slurry of Seed Grain in Organic Solvents by Milling

e. Systems of Grinding Sugar in Organic Fluids to be Used as Seed Grain

f. Different Techniques of Grinding

g. A New System of Special Seeding of the Footing to be Used for C-Strikes

h. When must the Seed Slurry be Introduced in the Pan?

Bibliography

8. Determination of Heat Transmission as an Indirect Method for the Determination of the Viscosity and Supersaturation of Technical Sugar Solutions.L. BOSWORTH, Sydney

1. Introduction

2. Relation Between Viscosity and Supersaturation

3. The Measurement of Heat Transmission

4. Theory of the Electrical Instrument

5. Heat Transmission Under Static Conditions

6. Heat Transmission Under Dynamic Conditions

7. Relation Between Viscosity and Velocity of Circulation

8. The Heat Transmission Recorder

Bibliography

9. Technology of Sugar Crystallization

1. Introduction

2. The Technology of Crystallization of Granulated Sugars

3. The Aims of Sugar Crystallization

4. Desugaration of Boilings and Nonsugar Circulation

5. Development of the Technology of Sugar Crystallization

6. The Crystallization Installation Consists of a Number of Interrelated Equipment Units

7. Fundamentals in the Practice of Sugar Boiling

8. The Significance of Circulation on Supersaturation

9. Feeding of Pans

10. Crystallization of Final Product Boilings

11. Application of Conductivity Control for the Crystallization Process

12. The Conductivity of Technical Sugar Solutions at Saturation Point

13. Supersaturation in Technical Sugar Crystallization

14. Technical Control Instrument for Conductivity Control

15. The Evaporating Surface in Vacuum Pans

16. Technological Investigations on the Crystallization Process

Bibliography

10. Evaporation and Circulation in the Crystallization Process

1. Introduction

2. Effective Driving Forces

a. Evaporation

b. Crystallization

c. Circulation

3. Effective Resistances

a. Evaporation

b. Crystallization

c. Circulation

4. The Effect of Temperature on Crystallization and Circulation

5. Measurements of Pan Circulation

6. Measurement of the Circulation Pattern

7. Circulation Patterns and their Interpretation

Bibliography

11. Natural and Mechanical Circulation in Vacuum Pans with Performance Data and Tests

1. Circulation in Vacuum Pans

a. Introduction

b. Downtakes and Tubes of Calandria Pans

c. Coil Pans

d. Ring Type Calandrias

e. The Shape of the Bottom

f. The Steam Side of the Heating Surface

g. Floating Calandrias

h. Supplemental Vents

i. How Fast is Natural Circulation?

j. Temperature Conditions in Vacuum Pans

k. Boiling Point Rise for 60 Purity

l. Hydrostatic Head Loss

m. Boiling Temperature Graph

n. Temperature-Pressure Graphs for Refinery Strikes

o. Significant Observed Fact on Pan Temperatures

p. Pan Temperature Investigations

q. The Real Mechanism of Natural Circulation

r. Conductivity of Massecuite

2. The Rehabilitation of Mechanical Circulation

a. Introduction

b. Old Circulators

c. Necessity of Mechanical Circulation

d. Basis of Design

e. Speed and Power Requirements

f. Benefits of Mechanical Circulation

g. Comparative Rating Curves

h. Quality of Crystals

i. Summary

3. Equipment and Operating Conditions for Satisfactory Vacuum Pan Performance

a. Introduction

b. Stable Conditions

c. Vacuum Control

d. Stable Steam Pressure

e. Instrumentation

f. Supersaturation Control

g. Steam Flow Meter

h. Crystallization

i. Significant Observations on Pan Operation

j. Vacuum Pan Tests

4. Application of Mechanical Circulators in the Sugar Industry Around the World

Bibliography

12. Crystallization of Massecuites by Cooling

1. Introduction

2. Solubility of Sucrose in Pure and Impure Solutions

3. The Rate of Crystallization of Sucrose

4. History of the Crystallizer Station

5. Types of Crystallizers and Cooling Systems

6. Construction Material and Shape of Cooling Elements

7. Heat Transfer Coefficients for Different Types of Massecuite

8. Speed of Rotation of Cooling Elements for Different Types of Massecuite

9. Crystallizer Drive and Power Consumption

10. Crystallizer Control and Control Instruments

11. Maintenance of Cooling Systems in Crystallizers

12. Time Needed for the Efficient Cooling of Different Types of Massecuite

13. Reduction in Total Massecuite Quantity by Rapid Cooling of First Boilings. Simplification of Boiling Scheme

a. Four-Boiling Scheme

b. Three-Boiling Scheme

14. Secondary Grain Formation in Crystallizers

15. Installation of Crystallizers. The Use of Massecuite Pumps

Bibliography

13. Conditioning of Massecuites in Crystallizers

1. Introduction

2. Supersaturation

a. Coefficient of Supersaturation

b. Saturation Temperature

c. Use of Saturoscope

d. Supersaturation in Crystallizer Practice

3. Viscosity

a. Rheology of Molasses and Massecuites

b. Effect of Nonsugar Constituents on Viscosity

c. Effect of Total Solids on Viscosity of Molasses

d. Effect of Temperature on Viscosity of Molasses

e. Relation of Purity of Molasses to Viscosity

f. Relation of Reducing Substances-Ash Ratio to Viscosity

4. Crystal Content and Size

a. Crystal Content

b. Crystal Size

5. Crystal Movement

6. Cooling

7. Reheating and Diluting

8. Conductivity Control

9. Molasses Exhaustibility

10. Summary and Conclusions

Bibliography

14. Maximum Recovery of Crystallized Sucrose from Low Grade Boilings

1. Introduction

2. Phase Rule Considerations

a. Eutectic Mixture Versus Saturated (Metastable) Solution of Sucrose

b. The Estimation of Fine Grain in Final Molasses According to Kalshoven

3. Hydrated Sugar-Salt Compounds

4. Solubility of Sucrose in Solutions Also Containing Nonsucrose Components

5. The Rate of Crystallization of Sucrose from Impure Solutions

6. Some Practical Considerations

7. Exhaustibility of Final Molasses

a. Statistical Target Purities

b. Methods of Judging Purities of Final Molasses Based on Exhaustibility Tests

c. Viscosity and Exhaustibility

d. Progress in Molasses Exhaustion

Bibliography

Author Index

Subject Index

Details

No. of pages:
586
Language:
English
Copyright:
© Elsevier 1959
Published:
Imprint:
Elsevier
eBook ISBN:
9781483278001

About the Editor

Pieter Honig